Luke 17:5

The disciples hearing our Lord discoursing of certain arduous duties, such as poverty, and avoiding offenses, entreat Him to increase their faith, that so they might be able to follow poverty, (for nothing so prompts to a life of poverty as faith and hope in the Lord,) and through faith to guard against giving offenses. Therefore it is said, And the Apostles said to the Lord, Increase our faith.

That is, that the faith which has already been received in its beginning, might go on increasing more and more to perfection.

We may indeed understand that they asked for the increase of that faith by which men believe in the things which they see not; but there is further signified a faith in things, whereby not with the words only, but the things themselves present, we believe. And this shall be, when the Wisdom of God, by whom all things were made, shall reveal Himself openly to His saints face to face.

But our Lord told them that they asked well, and that they ought to believe steadfastly, forasmuch as faith could do many things; and hence it follows, And the Lord; said, you had faith as a grain. of mustard seed, & c. Two mighty acts are here brought together in the same sentence; the transplanting of that which was rooted in the earth, and the planting thereof in the sea, (for what is ever planted in the waves?) by which two things He declares the power of faith.

He mentions the mustard seed, because, though small in size, it is mightier in power than all the others. He implies then that the least part of faith can do great things. But though the Apostles did not transplant the mulberry tree, do not you accuse them; for our Lord said not, You shall transplant, but, You shall be able to transplant. But they did not, because there was no need, seeing that they did greater things. But some one will ask, How does Christ say, that it is the least part of faith which can transplant a mulberry tree or a mountain, whereas Paul says that it is all faith which moves mountains? We must then answer, that the Apostle imputes the moving of mountains to all faith, not as though only the whole of faith could do this, but because this seemed a great thing to carnal men on account of the vastness of the body.

Or our Lord here compares perfect faith to a grain of mustard seed, because it is lowly in appearance, but fervid in heart. But mystically by the mulberry tree, (whose fruit and branches are red with a blood-red color,) is represented the Gospel of the cross, which, through the faith of the Apostles being uprooted by the word of preaching from the Jewish nation, in which it was kept as it were in the lineal stock, was removed and planted in the sea of the Gentiles.

Or this is said because faith keeps out the unclean spirit, especially since the nature of the tree falls in with this meaning. For the fruit of the mulberry is at first white in the blossom, and being formed from thence grows red, and blackens as it gets ripe. The devil also having by transgression fallen from the white flower of the angelic nature and the bright beams of his power, grows terrible in the black odor of sin.

The mulberry may be also compared to the devil, for as by the leaves of the mulberry tree certain worms are fed, so the devil, by the imaginations which proceed from him, is feeding for us a never dying worm; but this mulberry tree faith is able to pluck out of our souls, and plunge it into the deep.

3. Now if any man set Luke aside, as one who did not know the truth, he will, [by so acting,] manifestly reject that Gospel of which he claims to be a disciple. For through him we have become acquainted with very many and important parts of the Gospel; for instance, the generation of John, the history of Zacharias, the coming of the angel to Mary, the exclamation of Elisabeth, the descent of the angels to the shepherds, the words spoken by them, the testimony of Anna and of Simeon with regard to Christ, and that twelve years of age He was left behind at Jerusalem; also the baptism of John, the number of the Lord’s years when He was baptized, and that this occurred in the fifteenth year of Tiberius Cæsar. …

For, in fine, the agreement and harmony of the faith of both contribute to one end, salvation. We have in the apostle an unerring witness: “For I desire to see you, that I may impart unto you some spiritual gift, in order that ye may be strengthened; that is, that I may be comforted in you, by the mutual faith of you and me.” And further on again he adds, “The righteousness of God is revealed from faith to faith.” The apostle, then, manifestly announces a twofold faith, or rather one which admits of growth and perfection; for the common faith lies beneath as a foundation. To those, therefore, who desire to be healed, and are moved by faith, He added, “Thy faith hath saved thee.” But that which is excellently built upon is consummated in the believer, and is again perfected by the faith which results from instruction and the word, in order to the performance of the commandments. …

1. Our Lord Jesus Christ reproved unbelief even in His own disciples, as we heard just now when the Gospel was being read. For when they had said, “Why could not we cast him out?” He answered, “Because of your unbelief.” If the Apostles were unbelievers, who is a believer? What must the lambs do, if the rams totter? Yet the mercy of the Lord did not disdain them in their unbelief; but reproved, nourished, perfected, crowned them. For they themselves, as mindful of their own weakness, said to Him, as we read in a certain place in the Gospel, “Lord, increase our faith. Lord,” say they, “increase our faith.” The knowing that they had a deficiency, was the first advantage; a greater happiness still, to know who it was of whom they were asking. …

6. Therefore, to finish this discourse with that with which we began it, let us pray, and let us rely on God; let us live as He enjoineth; and when we totter in this life, let us call upon Him as the disciples called, saying, “Lord, increase our faith.” Peter both put his trust in Him, and tottered; but notwithstanding he was not disregarded and left to sink, but was lifted up and raised. For his trust whence was it? Not from anything of his own; but from what was the Lord’s. How? “Lord, if it be Thou, bid me come unto Thee on the water.” For on the water was the Lord walking. “If it be Thou, bid me come unto Thee on the water.” For I know that if it be Thou, Thou biddest, and it is done. “And He saith, Come.” He went down at His bidding, but in his own weakness he was afraid. …

1. The lesson of the Holy Gospel builds us up unto the duty of praying and believing, and of not putting our trust in ourselves, but in the Lord. What greater encouragement to prayer than the parable which is proposed to us of the unjust judge? For an unjust judge, who feared not God, nor regarded man, yet gave ear to a widow who besought him, overcome by her importunity, not inclined thereto by kindness. If he then heard her prayer, who hated to be asked, how must He hear who exhorts us to ask? When therefore by this comparison from a contrary case the Lord had taught that “men ought always to pray and not to faint,” He added and said, “Nevertheless, when the Son of Man shall come, thinkest thou that He shall find faith on the earth?” If faith fail, prayer perishes. …

63. “O learn me sweetness, and understanding, and knowledge,” he saith, “for I have believed Thy commandments” ( ver. 66 ). He prayeth these things may be increased and perfected. For they who said, “Lord, increase our faith,” had faith. And as long as we live in this world, these are the words of those who are making progress. But he addeth, “understanding,” or, as most copies read, “discipline.” Now the word discipline, for which the Greeks use παιδεία , is employed in Scripture, where instruction through tribulation is to be understood: according to the words, “Whom the Lord loveth He disciplineth, and scourgeth every son whom He receiveth.” In the literature of the Church this is usually called discipline. …

“And to another, faith:” not meaning by this faith the faith of doctrines, but the faith of miracles; concerning which Christ saith, “If ye have faith as a grain of mustard-seed, ye shall say to this mountain, Remove, and it shall remove.” (S. Matt. xvii. 20 .) And the Apostles too concerning this besought Him, saying, “Increase our faith:” (S. Luke xvii. 5 .) for this is the mother of the miracles. But to possess the power of working miracles and gifts of healing, is not the same thing: for he that had a gift of healing used only to do cures: but he that possessed powers for working miracles used to punish also. For a miracle is not the healing only, but the punishing also: even as Paul inflicted blindness: as Peter slew.

2. He professes in the first place to be replying to insinuations made at Rome against his orthodoxy, he being a man most fully approved in respect both of divine faith and of charity. He says that he would have wished to come himself, were it not that he had lately returned, after thirty years’ absence, to his parents, and that it would have seemed harsh and inhuman to leave them after having been so long in coming to them; and also if he had not become somewhat less robust through his long and toilsome journey, and too infirm to begin his labours again. As he had not been able to come himself, he had sent his apology as a kind of literary cudgel which the bishop might hold in his hand and drive away the dogs who were raging against him. …

9. Wouldest thou see yet more surely that some are saved by others’ faith? Lazarus died: one day had passed, and a second, and a third: his sinews were decayed, and corruption was preying already upon his body. How could one four days dead believe, and entreat the Redeemer on his own behalf? But what the dead man lacked was supplied by his true sisters. For when the Lord was come, the sister fell down before Him, and when He said, Where have ye laid him? and she had made answer, Lord, by this time he stinketh; for he hath been four days dead , the Lord said, If thou believe, thou shalt see the glory of God ; as much as saying, Supply thou the dead man’s lack of faith: and the sisters’ faith had so much power, that it recalled the dead from the gates of hell. …

17. Also our Saviour used thus to say to every one who drew near to Him to be healed: According to thy faith be unto thee . And when the blind man approached Him, He said to him: Dost thou believe that I am able to heal thee? That blind man said to Him: Yea, Lord, I believe . And his faith opened his eyes. And to him whose son was sick, He said: Believe and thy son shall live. He said to Him: I believe, Lord; help thou my feeble faith . And by his faith his son was healed. And also when the nobleman came near to Him, by his faith was his boy healed, when he said to our Lord: Speak the word and my servant will be cured . And our Lord was astonished at his faith, and according to his faith it happened to him. And also when the chief of the Synagogue requested Him concerning his daughter, He said thus to him: Only firmly believe and thy daughter shall live . …