The interpretation timeline
Matthew 6:7 Douay-Rheims

And when you are praying, speak not much, as the heathens. For they think that in their much speaking they may be heard.

A.D. 407 – 1871 10 witnesses 16 excerpts

Patristic

before A.D. 750
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“Hereby He dissuades from empty speaking in prayer; as, for example, when we ask of God things improper, as dominions, fame, overcoming of our enemies, or abundance of wealth. He commands then that our prayers should not be long; long, that is, not in time, but in multitude of words. For it is right that those who ask should persevere in their asking; being instant in prayer, as the Apostle instructs; but does not thereby enjoin us to compose a prayer of ten thousand verses, and speak it all; which He secretly hints at, when He says, Do not ye use many words.”
Source
“You do not then pray in order to teach God your wants, but to move Him, that you may become His friend by the importunity of your applications to Him, that you may be humbled, that you may be reminded of your sins.”
420
A.D.
Jerome Patristic
c. A.D. 347–420
“On this there starts up a heresy of certain Philosophers who taught the mistaken dogma, that If God knows for what we shall pray, and, before we ask, knows what we need, our prayer is needlessly made to one who has such knowledge. (Epicureans.) To such we shortly reply, That in our prayers we do not instruct, but entreat; it is one thing to inform the ignorant, another to beg of the understanding: the first were to teach; the latter is to perform a service of duty.”
Source
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“(ubi sup.) As the hypocrites use to set themselves so as to be seen in their prayers, whose reward is to be acceptable to men; so the Ethnici (that is, the Gentiles) use to think that they shall be heard for their much speaking; therefore He adds, When ye pray, do not ye use many words.”
“(Epist. 130, 10.) Yet to continue long in prayer is not, as some think, what is here meant, by using many words. For much speaking is one thing, and an enduring fervency another. For of the Lord Himself it is written, that He continued a whole night in prayer, and prayed at great length, setting an example to us. The brethren in Egypt are said to use frequent prayers, but those very short, and as it were hasty ejaculations, lest that fervency of spirit, which is most behoveful for us in prayer, should by longer continuance be violently broken off. Herein themselves sufficiently shew, that this fervency of spirit, as it is not to be forced if it cannot last, so if it has lasted is not to be violently broken off. Let prayer then be without much speaking, but not without much entreaty, if this fervent spirit can be supported; for much speaking in prayer is to use in a necessary matter more words than necessary. But to entreat much, is to importune with enduring warmth of heart Him to whom our entreaty is made; for often is this business effected more by groans than words, by weeping more than speech.”
Source
“(ubi sup.) And truly all superfluity of discourse has come from the Gentiles, who labour rather to practise their tongues than to cleanse their hearts, and introduce this art of rhetoric into that wherein they need to persuade God.”
“(ubi sup.) Nor ought we to use words in seeking to obtain of God what we would, but to seek with intense and fervent application of mind, with pure love, and suppliant spirit.”
“(Epist. 130, 9.) But even with words we ought at certain periods to make prayer to God, that by these signs of things we may keep ourselves in mind, and may know what progress we have made in such desire, and may stir up ourselves more actively to increase this desire, that after it have begun to wax warm, it may not be chilled and utterly frozen up by divers cares, without our continual care to keep it alive. Words therefore are needful for us that we should be moved by them, that we should understand clearly what it is we ask, not that we should think that by them the Lord is either instructed or persuaded.”
Source
“(Serm. in Mont. ii. 3.) Still it may be asked, what is the use of prayer at all, whether made in words or in meditation of things, if God knows already what is necessary for us. The mental posture of prayer calms and purifies the soul, and makes it of more capacity to receive the divine gifts which are poured into it. For God does not hear us for the prevailing force of our pleadings; He is at all times ready to give us His light, but we are not ready to receive it, but prone to other things. There is then in prayer a turning of the body to God, and a purging of the inward eye, whilst those worldly things which we desired are shut out, that the eye of the mind made single might be able to bear the single light, and in it abide with that joy with which a happy life is perfected.”
Source
435
A.D.
John Cassian Patristic
c. A.D. 360–435
“(Collat. ix. 36.) We should indeed pray often, but in short form, lest if we be long in our prayers, the enemy that lies in wait for us, might suggest something for our thoughts.”
604
A.D.
Gregory the Great Patristic
c. A.D. 540–604
“(Mor. xxxiii. 23.) True prayer consists rather in the bitter groans of repentance, than in the repetition of set forms of words.”

Scholastic

c. 1100 – 1500
1256
A.D.
Thomas Aquinas Catholic
1225–1274
“Peter of Scala, On Matthew, chapter 6, lecture 2: "And when you pray, you shall not be as the hypocrites." Here he removes, in the second place, the desire for human favor from prayer, and this contains three parts. First he excludes the desire for human favor; second he teaches the manner of praying, at "But thou, when thou shalt pray"; third he subjoins the due form of prayer, at "Thus therefore shall you pray," etc. The first part contains three things. First he removes from prayer the ostentation of hypocrites; second, the manner and end of that ostentation, at "who love to stand and pray in the synagogues and corners of the streets"; third he subjoins their condemnation, at "Amen I say to you, they have received their reward." He says therefore "and when you pray," that is, out of the affection of the mind. But here there is a question of the letter: why did he not say, in the singular, "when thou prayest," as he did above, and "when thou doest," etc.? Response: he speaks in the plural, "when you pray," because prayer belongs to all, since nothing temporal is required for it, only the intention of the heart; but giving alms does not belong to all. Or it may be said that prayer is made in two ways: in common, as in choir, and in solitude, etc. "You shall not be as the hypocrites," shining outwardly, foul within, below, chapter 23:27. "Who love." But it is asked why he does not say, "who pray." Chrysostom's response: because in truth they do not pray, but love to be seen as though they were praying. Along the same line it is asked why he did not say the same thing about almsgiving. Response: because although they give alms with an evil intention, they nevertheless give the thing itself. "In the synagogues," where the learned gather to pray, so that they may be seen. "Standing." He says this because it is the custom of the Jews to pray standing, since they received the law standing; Exodus 19:17, "they stood at the foot of the mountain," etc. "And in the corners of the streets," supply: they love to pray. Chrysostom: they seek to hide themselves so that they may be praised in a twofold way: first, because they pray; second, because they pray secretly. "That they may be seen by men." Behold the empty intention. Chrysostom: they do not intend to be heard, but to be seen; likewise the same: O madness of vanity! They do not wish to be what they desire to appear: they pray falsely, since they do not pray; and they are falsely praised, since they are not praiseworthy. They sell an empty semblance of religion, and they buy an empty word of praise. When the word is finished, the good that was placed in the word is also finished. Whence he fittingly subjoins, "Amen I say to you," as if to say: know for certain that "they have received their reward"; the Gloss: human praise; but from me they will receive eternal punishment. "But thou, when thou shalt pray," etc. This is the second part, where he gives the manner of praying. And first he shows the due manner; second he excludes from that manner the rite of the pagans, that is, much speaking, at "And when you are praying, speak not much." The first part is divided into two: first he gives the manner of praying; second he subjoins the promise, at "and thy Father, who seeth in secret, will repay thee." Now the manner of praying consists in three things. First, in the secrecy of meditation; second, in the exclusion of depraved affection, at "and having shut the door"; third, in rectitude of intention, at "pray to thy Father in secret." He says therefore, "but thou, when thou shalt pray, enter into thy chamber," that is, into the secrecy and inner recess of the mind, as Augustine says, and Rabanus, by the act of secret meditation. Chrysostom: God is not to be moved by a clamorous voice, but is to be appeased by a right conscience, for he is a hearer not of the voice but of the heart. Or, "enter into thy chamber" according to the letter. And he pointedly says "chamber," because then the soul ought to rest from external things when it prays; and then is the more fitting time, and the place more secret. Chrysostom: through the day a thousand causes surround you and do not permit you to be secret for prayer. But when you come to your bed, say to your soul: soul, how have we spent the day? What good or evil have we done? Ask God first, and then permit your soul to fall asleep. Thus did Judith, Judith 8:6; thus Peter, Acts 10:9; and Tobias, Tobit 3:10. "And having shut the door," that is, with every depraved and worldly affection excluded, or with the outer senses closed, as the Gloss says. Isaiah 26:20: "Go, my people, into thy chambers, and shut thy doors upon thee." "Pray to thy Father," the Gloss: he who is prayed to in spirit and in truth, John 4:23. Pray, not concerning worldly things. Isidore: far from God is the soul that has been occupied with the thoughts of the age. Jerome: it is one thing to relate to one who does not know, another to ask one who knows: the former is a disclosure, the latter a service. "In secret," that is, in the innermost part of the heart. Chrysostom: let the one praying do nothing new for men to look at, nor cry out with the voice, nor spread out the hands, nor shamelessly lift the eyes to heaven, so as to become conspicuous. "And thy Father, who seeth in secret, will repay thee." Behold, he subjoins the promise, saying, "and thy Father, who seeth in secret," that is, who beholds the heart; Hebrews 4:13: "all things are naked and open to his eyes." "Will repay thee." He does not say "will give," because he has already constituted himself a debtor, that is, he will for certain repay you the reward. Chrysostom: consider the philanthropy of God, that is, the love which he has for men; and consider with wonder the mercy of God, since even for those goods which are asked of him he promises to give a reward. "And when you are praying, speak not much." Here he excludes much speaking from prayer, where first he sets down the prohibition of much speaking; second the reason for the prohibition, at "Be you not therefore like to them." He says therefore, "and when you are praying, speak not much," that is, do not put your trust in words. On the contrary: 1 Thessalonians, last chapter, 17: "Pray without ceasing." Moreover the Lord persevered long in prayer, below, chapter 26:36ff., and Luke 6:12. The response, according to Augustine: he condemns much speaking arising from unbelief, but not the prayers which the saints make in purity of heart. Whence Anselm: it is not a sin to pray with devotion of heart through many words. "As the heathens do," for the gentiles multiplied words in their prayers, first, so that they might indicate their intention to the demons whom they worshiped, since otherwise the demons could not have known it; whence Augustine: for the gentiles a multiplicity of words was necessary on account of the demons. Second, so that they might call back to themselves the demons who were absent; and to this cause Elijah alludes, 1 Kings 18:27, saying to the priests of Baal, when they had prayed for a long time: "Cry with a louder voice: for he is a god, and perhaps he is talking, or is in an inn, or on a journey, or perhaps he is asleep, and must be awaked." Third, so that by the persuasion of words they might incline them to mercy; whence he adds: "for they think that in their much speaking they may be heard," that is, they suppose that by a multitude of persuasive words their prayers are made effective. And because they do so, "therefore be you not," my faithful ones, "like to them," namely in much speaking, so that you should believe God to be inclined by persuasive words. Isidore: men are not heard for their much speaking, as though they were striving by more words to bend God. Likewise, lest you think your God ignorant of what you ask: "for your Father knoweth what is need­ful for you." Behold the reason for the prohibition; as if to say: it is not fitting for you to pray with many words, but with deeds and with a simple affection of heart, says Rabanus. "For your Father knoweth what is need," that is, what is necessary for you, "before you ask him." Why then is it fitting to pray? Response: not that you may teach him, but that you may bend yourself, that you may be made familiar with him, that you may be humbled, that you may be reminded of your sins. And he pointedly says, "your Father." Chrysostom: by saying "Father," he signified in one word both the forgiveness of sins, and the destruction of punishments, and justification, and sanctification, and liberation, and the adoption of sons, and the inheritance of God, and brotherhood joined with the Only-Begotten, and the most abundant gifts of the Holy Spirit. Here Jerome and Rabanus ask: if God knows before we ask, to what purpose do we ask one who knows? Response: manifold is the reason why we speak to one who knows, and why we pray. The first, that we may profess and know that we have from him that which we ask; whence Rabanus: it is not necessary to relate, but to beseech. The second, that an example may be furnished; whence Rabanus: God wishes to be asked, so that his goodness may be conveyed to the peoples. The third, that our mind may be roused; whence Jerome: at the time of prayer we rouse ourselves. The fourth, that devotion may be roused in those standing by. Jerome: we speak, not that we may make a disclosure of our own will, but that we may rouse the service of pious devotion. The fifth, that desire may be kindled. The sixth, that the heart may be purified. Concerning these two the interlinear Gloss: by words the heart is kindled, and by prayers it is made serene. The seventh, that the mind, occupied about holy words, may be withdrawn from superfluous thoughts.”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“But when ye pray, use not vain repetitions,.... Saying the same things over and over again, as the Heathens do, as the worshippers of Baal, from morning till noon, Kg1 18:26. This our Lord observes, to dissuade from such practices, because the Gentiles, who were odious to the Jews, used them, and the Jews were guilty of the same; had they not, there would not have been any need of such advice: for they think they shall be heard for their much speaking; as did the Jews, who, under pretence of "long prayers", devoured widows' houses; and with whom it is an axiom, that "everyone , that multiplies prayer is heard" (h); and whoever prolongs his prayer, his prayer does not return empty; and he that is long in prayer, his days are prolonged (i): and, according to their canons, every day a man ought to pray eighteen prayers. Moreover, their prayer books abound in tautologies, and in expressing the same things in different words, and by a multiplicity of them. (h) T. Hieros. Taaniot, fol. 67. 3. (i) Zohar in Exod. fol. 104. 4.”
Source
1849
A.D.
1774–1849
“[ Speak not much .[2] ] Long prayer is not here forbidden; for Christ himself spent whole nights in prayer: and he sayeth, we must pray always; and the apostle, that we must pray without intermission, 1 Thessalonians v.; and the holy Church hath had from the beginning her canonical hours for prayer, but rhetorical and elaborate prayer, as if we thought to persuade God by our eloquence, is forbidden; the collects of the Church are most brief and most effectual. (St. Augustine, ep. 121. chap. viii, ix, x.) (Bristow) — Perseverance in prayer is recommended us by the example of the poor widow, who by her importunity prevailed over the unjust judge. (St. Chrysostom, hom. xix.) — The Greek word means, to babble or trifle.”
Source
1871
A.D.
1871
“But when ye pray, use not vain repetitions--"Babble not" would be a better rendering, both for the form of the word--which in both languages is intended to imitate the sound--and for the sense, which expresses not so much the repetition of the same words as a senseless multiplication of them; as appears from what follows. as the heathen do: for they think that they shall be heard for their much speaking--This method of heathen devotion is still observed by Hindu and Mohammedan devotees. With the Jews, says LIGHTFOOT, it was a maxim, that "Every one who multiplies prayer is heard." In the Church of Rome, not only is it carried to a shameless extent, but, as THOLUCK justly observes, the very prayer which our Lord gave as an antidote to vain repetitions is the most abused to this superstitious end; the number of times it is repeated counting for so much more merit. Is not this just that characteristic feature of heathen devotion which our Lord here condemns? But praying much, and using at times the same words, is not here condemned, and has the example of our Lord Himself in its favor.”
Source

Undated

date unknown
date
unknown
Glossa Ordinaria Medieval
“(ord.) What He condemns is many words in praying that come of want of faith; as the Gentiles do. For a multitude of words were needful for the Gentiles, seeing the dæmons could not know for what they petitioned, until instructed by them; they think they shall be heard for their much speaking.”
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.