The interpretation timeline
Colossians 3:20 Douay-Rheims

Children, obey your parents in all things: for this is well pleasing to the Lord.

A.D. 386 – 1871 6 witnesses

Patristic

before A.D. 750
386
A.D.
Cyril of Jerusalem Patristic
A.D. 313–386
“But while honoring our heavenly Father, let us also honor the "fathers of our flesh," since the Lord in the Law and the Prophets has clearly laid this down, saying: "Honor your mother and your father, that it may be well with you, and that you may have a long life in the land." Let those present who have mothers and fathers pay attention to this command. "Children, obey your parents in all things, for this is pleasing to the Lord." For our Lord did not say: "He who loves father or mother is not worthy of me," else what was well written you might interpret falsely out of ignorance, but he added "more than me."”
Source
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“Again he has put that, "in the Lord," at once laying down the laws of obedience, and shaming them, and casting them down. For this, saith he, is well-pleasing to the Lord. See how he would have us do all not from nature only, but, prior to this, from what is pleasing to God, that we may also have reward.”

Scholastic

c. 1100 – 1500
1272
A.D.
Thomas Aquinas Catholic
1225–1274
“Once the general instruction to all has been laid down, here he begins to set down the special instruction. First he gives certain special teachings pertaining to the individual states within the Church; second, certain teachings common to all states with respect to certain conditions, in chapter IV, at "be instant in prayer." The first is divided into three, according to the three bonds from which a household is constituted, according to the Philosopher: of which one is that of husband and wife; the second, of father and son; the other, of master and servant. The second is at "children." The third, at "servants." Each of these is divided into two, according as he admonishes the subjects to obey, and the superiors to command with moderation. He therefore says wives, etc., and he says as is fitting, because this subjection is ordained by divine law. Gen. 3:16: "you shall be under your husband's power, and he shall have dominion over you." 1 Cor. 14:34: "let women keep silence in the churches, for it is not permitted them to speak, but to be subject, as the law also says." And the reason for this is that to rule belongs to reason; but men are stronger in reason, and therefore ought to preside. Likewise he adds in the Lord, because all things ordained to certain ends must be referred finally to God. Then he admonishes the husbands to love them, saying husbands, love your wives, for this is natural, since husband and wife are in a certain way one. Eph. 5:25: "husbands, love your wives," et cetera. And he forbids that they be bitter toward them. Mic. 1:12: "she who dwells in bitterness has grown weak unto good." Eph. 4:31: "let all bitterness, and anger, and indignation, and clamor, and blasphemy be taken away from you, with all malice." Then when he says children, etc., he deals with the second, and says children, obey in all things, namely, those things which are not against God. Heb. 12:9: "we have indeed had the fathers of our flesh for instructors, and we reverenced them," et cetera. But if they should command in matters that are against God, then that saying is to be understood which is said in Lk. 14:26: "if anyone comes to me and does not hate his father and mother," et cetera. And this, because this is well-pleasing to the Lord, that is, according to the law of the Lord, because the law of charity does not remove the law of nature, but perfects it. Now it is a law of nature that the son be subject to the care of the father. Ex. 20:12: "honor your father and your mother," et cetera. Then when he says fathers, do not, etc., he instructs the parents. Eph. 6:4: "and you, fathers, do not provoke your children to wrath," et cetera. And this, lest they become of small spirit, that is, lest they become fainthearted. And the reason for this is that men retain the impression which they had from childhood. Now it is natural that those who are reared in servitude should always be fainthearted. Whence a certain one gives this as the reason why the children of Israel were not led at once into the land of promise: because they had been reared in servitude, and would not have had the boldness to fight against enemies. Is. 35:4: "say to the fainthearted," et cetera. Then when he says servants, obey, he deals with the third; and first he sets down the admonition concerning servants; second he shows the reason, at knowing; third he excludes a doubt, at for he who. Concerning the first he does two things: first he admonishes them to obedience; second he determines the manner of obeying, at not to the eye. He says therefore servants, according to the condition of the flesh, obey in all things, namely those things which are not against God. 1 Pet. 2:18: "not only to the good and gentle, but also to the froward," et cetera. 1 Tim., last chapter: "whoever are under the yoke of servitude, let them esteem their masters worthy of all honor." Then when he says not to the eye, he teaches the manner of obeying. And he shows two manners of obeying: first, that it be simply and without deceit; second he shows that it be willingly. He says therefore not to the eye, namely, only insofar as it can be seen by the master. Eph. 6:6, similarly. And he says as pleasing men, because they serve in this manner only so as to please men. Gal. 1:10: "if I still pleased men, I would not be a servant of Christ." Therefore he adds but in simplicity of heart, etc., that is, without deceit, fearing the Lord, as in Job 1:1: "that man was simple and upright, and fearing God." Prov. 11:3: "the simplicity of the just shall guide them," et cetera. Likewise, willingly; hence he says whatsoever you do, from the heart, that is, readily, work. And this as to the Lord, because he who serves someone on account of the order of justice does this on account of God, from whom this order comes. Rom. 13:2: "he who resists authority resists the ordinance of God." Eph. 6:6: "doing the will of God from the heart, serving with good will, as," et cetera. Then when he says knowing, he shows a twofold reason for this: one on the part of reward, the other on the part of devotion to God. He says therefore: serve readily, because from the Lord you will receive the recompense of an eternal inheritance. Ps. 15:6: "the lines have fallen unto me in goodly places, yea, my inheritance is goodly unto me." Eph. 6:8: "knowing that whatsoever good thing each one shall have done, this he shall receive from the Lord, whether servant or free." For it was the opinion of some that an act of justice is not meritorious, because this seemed to be owed, and it is not meritorious to give someone what is his own. But it must be known that from the fact that you do it willingly, from this you put in something of your own, because it is within your power to will or not to will, and thus it is meritorious. Servants, however, serve their master out of debt, and therefore, that they may have a reward, they do this willingly. But serve them in such a way that you do not withdraw from God. Likewise another reason is that in this way you serve the Lord Christ. Rom. 12:11: "fervent in spirit, to the Lord," et cetera. Then when he says for he who, he removes a doubt. For a servant might say: how shall I serve one who does me wrong? And so he says: it is not yours to avenge yourself, by withholding from him what is his, but await it from him who is able, because he who does wrong, et cetera. 2 Cor. 5:10: "for we must all be made manifest before the judgment seat of Christ, that each may receive the things proper to the body, according to what he has done, whether good or evil." Eph. 6:9: "and there is no respect of persons with God." Acts 10:34: "God is not a respecter of persons." Then when he says masters, he shows how masters should conduct themselves toward servants. And concerning this he does two things: first he gives the teaching; second he renders the reason for it, at knowing. Now a master can burden his servants in two ways: namely, by doing against them what the justice of the law forbids, since according to the laws it is not lawful for a master to be savage toward a servant. Therefore he says what is just. Likewise, if he should exact the whole debt, which Christian gentleness mitigates. Therefore he says and equitable. Job 31:13: "if I have despised to submit," et cetera. Then when he says knowing, etc., the reason is given, because as you conduct yourself toward them, so the Lord toward you. Eph. 6:8: "knowing," et cetera.”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“Children, obey your parents,.... Both father and mother; See Gill on Eph 6:1. in all things; not in things sinful, which are contrary to the law of God, and Gospel of Christ; in things repugnant to the duties of religion, the ordinances of the Gospel, and the doctrines of Christ, parents are to be neglected and disobeyed. God is to be regarded, and not men; but in all things good and lawful, and in all things that are of an indifferent nature, which may, or may not be done, in these things the will of earthly parents is to be attended to; of which there is a considerable instance in the Rechabites, see Jer 35:6 and even they are to be obeyed in things that are hard and difficult to be complied with, and which are disagreeable to flesh and blood, as the cases of Isaac and Jephthah's daughter show. For this is well pleasing unto the Lord; and is a reason sufficient to engage to the performance of the duty; for whatever is grateful and well pleasing to God ought to be done with pleasure by us, from a principle of love to him, by faith in him, and with a view to his glory; and then such an action is acceptable in his sight through Jesus Christ our Lord. The Alexandrian copy reads, "in the Lord"; and so the Vulgate Latin version.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“Children, obey - in all things - That is, in the Lord - in every thing that your parents command you, which is not contrary to the will or word of God.”
1871
A.D.
1871
“(Eph 6:1.) unto the Lord--The oldest manuscripts read, "IN the Lord," that is, this is acceptable to God when it is done in the Lord, namely, from the principle of faith,and as disciples in union with the Lord.”
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.