The interpretation timeline
Mark 1:40 Douay-Rheims

And there came a leper to him, beseeching him, and kneeling down said to him: If thou wilt, thou canst make me clean.

A.D. 407 – 1832 8 witnesses 17 excerpts

Patristic

before A.D. 750
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“(Hom. 25. in Matt) Further, the reason why He touches the leper, and did not confer health upon him by word alone, was, that it is said by Moses in the Law, that he who touches a leper, shall be unclean till the evening; that is, that he might shew, that this uncleanness is a natural one, that the Law was not laid down for Him, but on account of mere men. Furthermore, He shews that He Himself is the Lord of the Law; and the reason why He touched the leper, though the touch was not necessary to the working of the cure, was to shew that He gives health, not as a servant, but as the Lord.”
Source
“(non occ.) For the leper every where proclaimed his wonderful cure, so that all ran to see and to believe on the Healer; thus the Lord could not preach the Gospel, but walked in desert places; wherefore there follows, And they came together to him from all places.”
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“(de Con. Evan. ii. 19) Mark puts together circumstances, from which one may infer that he is the same as that one whom Matthew (Matt. 8:2) relates to have been cleansed, when the Lord came down from the mount, after the sermon.”
735
A.D.
Bede the Venerable Patristic
c. A.D. 672–735
“(in Marc. i. 7) After that the serpent-tongue of the devils was shut up, and the woman, who was first seduced, cured of a fever, in the third place, the man, who listened to the evil counsels of the woman, is cleansed from his leprosy, that the order of restoration in the Lord might be the same as was the order of the fall in our first parents; whence it goes on: And there came a leper to him, beseeching him.”
Source
“(in Marc. i. 9) And because the Lord said that He came not to destroy the Law but to fulfill, (Matt. 5:17) he who was excluded by the Law, inferring that he was cleansed by the power of the Lord, shewed that that grace, which could wash away the stain of the leper, was not from the Law, but over the Law. And truly, as in the Lord authoritative power, so in him the constancy of faith is shewn; for there follows, Lord, if thou wilt, thou canst make me clean. He falls on his face, which is at once a gesture of lowliness and of shame, to shew that every man should blush for the stains of his life. But his shame did not stifle confession; he shewed his wound, and begged for medicine, and the confession is full of devotion and of faith, for he refers the power to the will of the Lord.”
Source
“(ubi sup.) Another reason why He touched him, was to prove that He could not be defiled, who freed others from pollution. At the same time it is remarkable, that He healed in the way in which He had been begged to heal. If thou will, says the leper, thou canst make me clean. I will, He answered, behold, thou hast My will, be clean; now thou hast at once the effect of My compassion.”
Source
“(ubi sup.) For there is no interval between the work of God and the command, because the work is in the command, for He commanded, and they were created. (Ps. 148:5) There follows: And he straitly charged him, and forthwith, &c. See thou tell no man.”
“(ubi sup.) If any one wonders, how the Lord seems to approve of the Jewish sacrifice, which the Church rejects, let him remember, that He had not yet offered His own holocaust in His passion. And it was not right that significative sacrifices should be taken away, before that which they signified was confirmed by the witness of the Apostles in their preaching, and by the faith of the believing people.”
Source
“(ubi sup. v. Greg. Moral. 19:22) Now it may well be asked, why our Lord ordered His action to be concealed, and yet it could not be kept hid for an hour? But it is to be observed, that the reason why, in doing a miracle, He ordered it to be kept secret, and yet for all that it was noised abroad, was, that His elect, following the example of His teaching, should wish indeed that in the great things which they do, they should remain concealed, but should nevertheless unwillingly be brought to light for the good of others. Not then that He wished any thing to be done, which He was not able to bring about, but, by the authority of His teaching, He gave an example of what His members ought to wish for, and of what should happen to them even against their will.”
Source
“(in Marc. i. 10) Even after working a miracle in that city, the Lord retires into the desert, to shew that He loves best a quiet life, and one far removed from the cares of the world, and that it is on account of this desire, He applied Himself to the healing of the body.”

Scholastic

c. 1100 – 1500
1107
A.D.
c. 1055–1107
“For he said not, If thou wilt, pray unto God, but, If thou wilt, as thinking Him very God.”
“He ordered him to offer the gift which they who were healed were accustomed to offer, as if for a testimony, that He was not against the Law, but rather confirmed the Law, inasmuch as He Himself worked out the precepts of the Law.”

Post-Reformation

c. 1650 – 1900
1714
A.D.
Matthew Henry Reformed
1662–1714
“We have here the story of Christ's cleansing a leper, which we had before, Mat 8:2-4. It teaches us, 1. How to apply ourselves to Christ; come as this leper did, (1.) With great humility; this leper came beseeching him, and kneeling down to him (Mar 1:40); whether giving divine honour to him as God, or rather a less degree of respect as a great Prophet, it teaches us that those who would receive grace and mercy from Christ, must ascribe honour and glory to Christ, and approach to him with humility and reverence. (2.) With a firm belief of his power; Thou canst make me clean. Though Christ's outward appearance was but mean, yet he had this faith in his power, which implies his belief that he was sent of God. He believes it with application, not only in general, Thou cast do every thing (as Joh 11:22), but, Thou cast make me clean. Note, What we believe of the power of Christ we must bring home to our particular case; Thou canst do this for me. (3.) With submission to the will of Christ; Lord, if thou wilt. Not as if he had any doubt of Christ's readiness in general to help the distressed, but, with the modesty that became a poor petitioner, he refers his own particular case to him. 2. What to expect from Christ; that according to our faith it shall be to us. His address is not in the form of prayer, yet Christ answered it as a request. Note, Affectionate professions of faith in Christ, and resignations to him, are the most prevailing petitions for mercy from him, and shall speed accordingly. (1.) Christ was moved with compassion. This is added here, in Mark, to show that Christ's power is employed by his pity for the relief of poor souls; that his reasons are fetched from within himself, and we have nothing in us to recommend us to his favour, but our misery makes us the objects of his mercy. And what he does for us he does with all possible tenderness. (2.) He put forth his hand, and touched him. He exerted his power, and directed it to this creature. In healing souls, Christ toucheth them, Sa1 10:26. When the queen toucheth for the evil, she saith, I touch, God heals; but Christ toucheth and healeth too. (3.) He said, I will, be thou clean. Christ's power was put forth in and by a word, to signify in what way Christ would ordinarily work spiritual cures; He sends his word and heals, Psa 107:20; Joh 15:3; Joh 17:17. The poor leper put an if upon the will of Christ; If thou wilt; but that doubt is soon put out of doubt; I will. Christ most readily wills favours to those that most readily refer themselves to his will. He was confident of Christ's power; Thou canst make me clean; and Christ will show how much his power is drawn out into act by the faith of his people, and therefore speaks the word as one having authority, Be thou clean. And power accompanied this word, and the cure was perfect in an instant; Immediately his leprosy vanished, and there remained no more sign of it, Mar 1:42. 3. What to do when we have received mercy from Christ. We must with his favours receive his commands. When Christ had cured him, he strictly charged him; the word here is very significant, embrimēsamenos - graviter interminatus - prohibiting with threats. I am apt to think that this refers not to the directions he gave him to conceal it (Mar 1:44), for those are mentioned by themselves; but that this was such a charge as he gave to the impotent man whom he cured, Joh 5:14, Sin no more, lest a worse thing come unto thee; for the leprosy was ordinarily the punishment of some particular sinners, as in Miriam's, Gehazi's, and Uzziah's, case; now, when Christ healed him, he warned him, he threatened him with the fatal consequence of it if he should return to sin again. He also appointed him, (1.) To show himself to the priest, that the priest by his own judgment of this leper might be a witness for Christ, that he was the Messiah, Mat 11:5. (2.) Till he had done that, not to say any thing of it to any man: this is an instance of the humility of Christ and his self-denial, that he did not seek his own honour, did not strive or cry, Isa 42:2. And it is an example to us, not to seek our own glory, Pro 25:27. He must not proclaim it, because that would much increase the crowd that followed Christ, which he thought was too great already; not as if he were unwilling to do good to all, to as many as came; but he would do it with as little noise as might be, would have no offence given to the government, no disturbance of the public peace, not any thing done that looked like ostentation, or an affecting of popular applause. What to think of the leper's publishing it, and blazing it abroad, I know not; the concealment of the good characters and good works of good men better become them than their friends; nor are we always bound by the modest commands of humble men. The leper ought to have observed his orders; yet, no doubt, it was with a good design that he proclaimed the cure, and it had no other ill effect than that it increased the multitudes which followed Christ, to that degree, that he could no more openly enter into the city; not upon the account of persecution (there was no danger of that yet,) but because the crowd was so great, that the streets would not hold them, which obliged him to go into desert places, to a mountain (Mar 3:13), to the sea-side, Mar 4:1. This shows how expedient it was for us, that Christ should go away, and send the Comforter, for his bodily presence could be but in one place at a time; and those that came to him from every quarter, could not get near him; but by his spiritual presence he is with his people wherever they are, and comes to them to every quarter.”
Source
1771
A.D.
John Gill Reformed
1697–1771
“And there came a leper to him,.... After he was come down from a certain mountain, in Galilee, where he had been preaching to the people, Mat 8:1, and when be was in a certain city, Luk 5:12, either Capernaum, or some other city of Galilee. This man was full of leprosy, as Luke says, and very probably deemed incurable; of the nature and symptoms of the leprosy; see Gill on Luk 5:12, beseeching him; to cure him of his leprosy: and kneeling down to him; in token of submission, respect, and reverence, and to worship him: and saying unto him, if thou wilt thou canst make me clean; See Gill on Mat 8:2. Mark omits the word "Lord".”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“There came a leper - See the notes on Mat 8:2, etc. Should any be inclined to preach on this cleansing of the leper, Mark is the best evangelist to take the account from, because he is more circumstantial than either Matthew or Luke. I. Consider this leper. 1. He heard of Jesus and his miracles. 2. He came to him for a cure, conscious of his disease. 3. He earnestly besought him to grant the mercy he needed. 4. He fell down on his knees, (with his face to the earth, Luk 5:12), thus showing his humbled state, and the distress of his soul. 5. He appealed to his love - if thou wilt; with a full conviction of his ability - thou canst; in order to get healed. II. Consider Jesus. 1. He is moved with tender compassion towards him: this is the alone source of all human salvation. 2. He stretches forth his hand, showing thus his readiness to relieve him. 3. He touches him; though this was prohibited by the law, and rendered him who did it in any common case legally unclean. 4. He proves at once his infinite love and unlimited power, by his word and by his act; I will - be thou cleansed; and immediately his leprosy was removed. But see on Mat 8:2 (note).”
Source

Undated

date unknown
date
unknown
“Mystically, our leprosy is the sin of the first man, which began from the head, when he desired the kingdoms of the world. For covetousness is the root of all evil; wherefore Gehazi, engaged in an avaritious pursuit, is covered with leprosy.”
“This leprosy is cleansed on offering an oblation to the true Priest after the order of Melchisedec; for He tells us, Give alms of such things as ye have, and, behold, all things are clean unto you. (Luke 11:41) But in that Jesus could not openly enter into the city, it is meant to be conveyed, that Jesus is not manifested to those, who are enslaved to the love of praise in the broad highway, and to their own wills, but to those who with Peter go into the desert, which the Lord chose for prayer, and for refreshing His people; that is, those who quit the pleasures of the world, and all that they possess, that they may say, The Lord is my portion. But the glory of the Lord is manifested to those, who meet together on all sides, that is, through smooth ways and steep, whom nothing can separate from the love of Christ. (Rom. 8:35)”
Source
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.