31 And Jesus answering said unto them, They that are whole need not a physician; but they that are sick.
[AD 202] Irenaeus on Luke 5:31
Or what medical man, anxious to heal a sick person, would prescribe in accordance with the patient's whims, and not according to the requisite medicine? But that the Lord came as the physician of the sick, He does Himself declare saying, "They that are whole need not a physician, but they that are sick; I came not to call the righteous, but sinners to repentance."

[AD 220] Tertullian on Luke 5:31
He had nowhere read of Christ's being foretold as the light, and hope, and expectation of the Gentiles! He, however, rather spoke of the Jews in a favourable light, when he said, "The whole needed not a physician, but they that are sick." For since by "those that are sick" he meant that the heathens and publicans should be understood, whom he was choosing, he affirmed of the Jews that they were "whole" for whom he said that a physician was not necessary.

[AD 220] Tertullian on Luke 5:31
He will love the flesh which is, so very closely and in so many ways, His neighbour-(He will love it), although infirm, since His strength is made perfect in weakness; although disordered, since "they that are whole need not the physician, but they that are sick; " although not honourable, since "we bestow more abundant honour upon the less honourable members; " although ruined, since He says, "I am come to save that which was lost; " although sinful, since He says, "I desire rather the salvation of the sinner than his death; " although condemned, for says He, "I shall wound, and also heal.

[AD 379] Basil of Caesarea on Luke 5:27-32
(Reg. fus. tract. 8.) He not only gave up the profits of the customs, but also despised the dangers which might occur to himself and his family from leaving the accounts of the receipts uncompleted.

[AD 395] Gregory of Nyssa on Luke 5:27-32
Or, He means that the sound and righteous need no physician, i. e. the angels, but the corrupt and sinners, i. e. ourselves do; since we catch the disease of sin, which is not in heaven.

[AD 397] Ambrose of Milan on Luke 5:29-32
Then follows the spiritual calling of the tax collector, whom he orders to follow him not by steps of the body but by character of the mind. Matthew once greedily embezzled from fishermen the profits they earned from hard labor and dangers. When he was called, he abandoned his office, which was to rob others of their money. Yes, he left that shameful seat, to walk totally in the footsteps of the Lord with his mind. He also prepared a great feast, because he who receives Christ in the house inside him eats the finest foods—plentiful pleasures. So the Lord enters willingly and reclines in the character of one who has believed.

[AD 397] Ambrose of Milan on Luke 5:29-32
People are hungry when Christ is absent and they lack the abundance of good desserts. Truly, one for whom his own virtue suffices for pleasure, who receives Christ in his own home, prepares a great feast. It is a spiritual banquet of good works, at which the rich people go without and the poor one feasts. It says, “The sons of the Bridegroom cannot fast while the Bridegroom is with them.”

[AD 397] Ambrose of Milan on Luke 5:27-32
Or it may reseek its own home, i. e. return to Paradise, for that is its true home, which first received man, and was lost not fairly, but by treachery. Rightly then is the soul restored thither, since He has come Who will undo the treacherous knot, and reestablish righteousness.

For by His eating with sinners, He prevents not us also from going to a banquet with the Gentiles.

This was the voice of the Devil. This was the first word the Serpent uttered to Eve, Yea hath God said, Ye shall not eat. (Gen. 3:1) So they diffuse the poison of their father.

But how does God love righteousness, and David has never seen the righteous man forsaken, if the righteous are excluded, the sinner called; unless you understand that He meant by the righteous those who boast of the law, (Ps. 11:7, Ps. 37:25.) and seek not the grace of the Gospel. Now no one is justified by the law, but redeemed by grace. He therefore calls not those who call themselves righteous, for the claimers to righteousness are not called to grace. For if grace is from repentance, surely he who despises repentance renounces grace.

But He calls those sinners, who considering their guilt, and feeling that they cannot be justified by the law, submit themselves by repentance to the grace of Christ.

But he who receives Christ into his inner chamber, is fed with the greatest delights of overflowing pleasures. The Lord therefore willingly enters, and reposes in his affection; but again the envy of the treacherous is kindled, and the form of their future punishment is prefigured; for while all the faithful are feasting in the kingdom of heaven, the faithless will be cast out hungry. Or, by this is denoted the envy of the Jews, who are afflicted at the salvation of the Gentiles.

At the same time also is shown the difference between those who are zealous for the law and those who are for grace, that they who follow the law shall suffer eternal hunger of soul, while they who have received the word into the inmost soul, refreshed with abundance of heavenly meat and drink, can neither hunger nor thirst. And so they who fasted in soul murmured.

[AD 407] John Chrysostom on Luke 5:27-32
(Hom. 30. in Matt.) Here mark both the power of the caller, and the obedience of him that was called. For he neither resisted nor wavered, but forthwith obeyed; and like the fishermen, he did not even wish to go into his own house that he might tell it to his friends.

(ubi sup.) But the Lord honoured Levi, whom He had called, by immediately going to his feast. For this testified the greater confidence in him. Hence it follows, And Levi made him a great feast in his own house. Nor did He sit down to meat with him alone, but with many, as it follows, And there was a great company of Publicans and others that sat down with them. For the publicans came to Levi as to their colleague, and a man in the same line with themselves, and he too glorying in the presence of Christ, called them all together. For Christ displayed every sort of remedy, and not only by discoursing and displaying cures, or even by rebuking the envious, but also by eating with them, He corrected the faults of some, thereby giving us a lesson, that every time and occasion brings with it its own profit. But He shunned not the company of Publicans, for the sake of the advantage that might ensue, like a physician, who unless he touch the afflicted part cannot cure the disease.

(ubi sup.) But nevertheless the Lord was blamed by the Pharisees, who were envious, and wished to separate Christ and His disciples, as it follows, And the Pharisees murmured, saying, Why do you eat with Publicans, &c.

(ubi sup.) But our Lord refutes all their charges, showing, that so far from its being a fault to mix with sinners, it is but a part of His merciful design, as it follows, And Jesus answering said unto them, They that are whole need not a physician; in which He reminds them of their common infirmities, and shows them that they are of the number of the sick, but adds, He is the Physician. It follows, I came not to call the righteous, but sinners to repentance. As if He should say, So far am I from hating sinners, that for their sakes only I came, not that they should remain sinners, but be converted and become righteous.

Now He speaks of the righteous ironically, as when He says, Behold Adam is become as one of us. (Gen. 3:22.) But that there was none righteous upon the earth St. Paul shows, saying, All have sinned, and need the grace of God. (Rom. 3:23.)

[AD 444] Cyril of Alexandria on Luke 5:30-31
But for what reason do the Pharisees blame the Savior for eating with sinners? Because it was the law to distinguish between the holy and the profane, that is, holy things were not to be brought into contact with things profane. They made the accusation therefore as if they were vindicating the law. Yet it really was envy against the Lord and readiness to find fault. But he shows them that he is present now, not as a judge but as a physician. He performs a proper function of the physician's office, being in the company of those in need to be healed. But no sooner had they received an explanation of their first accusation than they bring forward another, finding fault because his disciples did not fast. They wished to use this charge as an opportunity to accuse Christ.

[AD 735] Bede on Luke 5:31
And Jesus, answering, said to them: Those who are well do not need a physician, but those who are sick. I have not come to call the righteous, but sinners to repentance. He castigates the scribes and Pharisees, who, considering themselves just, avoided the company of sinners. For he calls himself a physician who, by a marvelous method of healing, was wounded for our iniquities, and by his bruises we are healed (Isa. LIII). He calls those healthy and righteous who, ignorant of God's righteousness and wanting to establish their own, are not subject to the righteousness of God, who, presuming from the law, do not seek the grace of the Gospel. On the other hand, he calls sick and sinners those who, defeated by the consciousness of their own frailty, and seeing that they cannot be justified by the law, submit themselves to Christ's grace by repenting. Here it is shown at the same time that publicans have come to Jesus performing repentance, not remaining in their former sins, as the Pharisees and scribes murmured: and Jesus himself also deigned to go to the feasts of sinners to have the opportunity of teaching and offering spiritual food to his hosts. Finally, while it is frequently described that he went to banquets, nothing else is reported except what he did there, what he taught, so that both the humility of the Lord in going to sinners and the power of his teaching in the conversion of penitents might be shown.

[AD 735] Bede on Luke 5:29-32
“I have not come to call the just but sinners” can also be properly understood in this way. He has not called those who, wishing to establish their own justice, have not been made subject to the justice of God. He calls those who, being conscious of their weakness, are not ashamed to confess that we have all offended in many things. In them too is fulfilled his saying that he had not come to call the just but sinners. That is, he does not call the exalted but the humble. He does not call those puffed up about their own justice but those showing themselves devotedly subject to the one who justifies the wicked. Such people, when they are converted, bear witness with a sincere heart that they must not be regarded as just, but sinners.It is a pleasure to remember, beloved, … to what a height of justice the Lord fetched Matthew, whom he chose out of his tax collecting activities in order to increase for sinners their hope of forgiveness. The apostolic band into which he was incorporated teaches what kind of person he became.

[AD 735] Bede on Luke 5:27-32
Now Luke and Mark, for the honour of the Evangelist, are silent as to his common name, but Matthew is the first to accuse himself, and gives the name of Matthew and publican, that no one might despair of salvation because of the enormity of his sins, when he himself was changed from a publican to an Apostle.

Now by the election of Matthew is signified the faith of the Gentiles, who formerly gasped after worldly pleasures, but now refresh the body of Christ with zealous devotion.

[AD 1107] Theophylact of Ohrid on Luke 5:27-32
And so from him that received toll from the passers by, Christ received toll, not money, but entire devotion to His company.

Or the publican is he who serves the prince of this world, and is debtor to the flesh, to which the glutton gives his food, the adulterer his pleasure, and another something else. But when the Lord saw him sitting at the receipt of custom, and not stirring himself to greater wickedness, He calls him that he might be snatched from the evil, and follow Jesus, and receive the Lord into the house of his soul.