Fathers

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What the Fathers say

John 13:17

Eastern Fathers

John Chrysostom

Then, lest any one should say, "Why now sayest Thou these things? Do we not already know them?" He addeth this very thing, "I speak not to you as not knowing, but that by your actions ye may show forth the things spoken of." For "to know," belongeth to all; but "to do," not to all. On this account He said, "Blessed are ye if ye do them"; and on this account I continually and ever say the same to you, although ye know it, that I may set you on the work. …

Homily on the Gospel of John 71 ↗

Cyril of Alexandria

If therefore ye understand these things, He saith----that is, "if ye can clearly perceive the meaning of what I am saying,"----blessed are ye if ye do them. For it is not the knowledge of virtue, but rather the practice of it, that may well be pronounced worthy of both love and zeal. …

Commentary on the Gospel of John, Book 9 ↗

Theophylact of Ohrid

Lest they should say, "Why do You tell us about this, as if we did not know? We ourselves know that humility is good," He therefore says, "If you know these things, this alone is not enough, but you are blessed when you do them." For the Jews also knew the commandments, but they are not blessed, but rather most wretched, because they did not fulfill them.

Commentary on John ↗

Western Saints

Augustine of Hippo

We have just heard in the holy Gospel the Lord speaking, and saying, "Verily, verily, I say unto you, The servant is not greater than his lord, nor the apostle greater than he that sent him: if ye know these things, blessed shall ye be if ye do them." He said this, therefore, because He had washed the disciples' feet, as the Master of humility both by word and example. But we shall be able, with His help, to handle what is in need of more elaborate handling, if we linger not at what is perfectly clear.

Tractates on John 59 ↗

Bede

To know what is good, and not to do it, tendeth not to happiness, but to condemnation; as James saith, To him that knoweth to do good, and doeth it not, to him it is sin (James 4:17). Wherefore He adds, If ye know these things, happy are ye if yo do them.

Catena Aurea by Aquinas ↗

Thomas Aquinas

When he says, If you know these things, blessed are you if you do them, he strengthens his conclusion by a reward. First, he mentions the reward; secondly, he excludes someone from it (v 18). If you know these things, which many do know, blessed are you if you do them, which is true of few. He says, "know" and "do" because we read: "Blessed are those who hear the word of God and keep it" (Lk 11:28); and "A good understanding have all those who practice it" (Ps 111:10). …

Commentary on John ↗