1 So is this world to all the faithful seeking their own country, as was the desert to the people Israel. They wandered indeed as yet, and were seeking their own country: but with God for their guide they could not wander astray. Their way was God's bidding. For where they went about during forty years, the journey itself is made up of a very few stations, and is known to all. They were retarded because they were in training, not because they were forsaken. That therefore which God promises us is ineffable sweetness and a good, as the Scripture says, and as you have often heard by us rehearsed, which “eye has not seen, nor ear heard, neither has entered into the heart of man.” But by temporal labors we are exercised, and by temptations of this present life are trained. Howbeit, if you would not die of thirst in this wilderness, drink charity. It is the fountain which God has been pleased to place here that we faint not in the way: and we shall more abundantly drink thereof, when we have come to our own land. The Gospel has just been read; now to speak of the very words with which the lesson ended, what other thing heard ye but concerning charity? For we have made an agreement with our God in prayer, that if we would that He should forgive us our sins, we also should forgive the sins which may have been committed against us. Now that which forgives is none other than charity. Take away charity from the heart; hatred possesses it, it knows not how to forgive. Let charity be there, and she fearlessly forgives, not being straitened. And this whole epistle which we have undertaken to expound to you, see whether it commends anything else than this one thing, charity. Nor need we fear lest by much speaking thereof it come to be hateful. For what is there to love, if charity come to be hateful? It is by charity that other things come to be rightly loved; then how must itself be loved! Let not that then which ought never to depart from the heart, depart from the tongue.
2. “Now,” says he, “are you of God little children, and have overcome him:” whom but Antichrist? For above he had said, “Whosoever unmakes Jesus Christ and denies that He has come in the flesh is not of God.” Now we expounded, if you remember, that all those who violate charity deny Jesus Christ to have come in the flesh. For Jesus had no need to come but because of charity: as indeed the charity we are commending is that which the Lord Himself commends in the Gospel, “Greater love than this can no man have, that a man lay down his life for his friends.” How was it possible for the Son of God to lay down His life for us without putting on flesh in which He might die? Whosoever therefore violates charity, let him say what he will with his tongue, his life denies that Christ has come in the flesh; and this is an antichrist, wherever he may be, wherever he have come in. But what says the apostle to them who are citizens of that country for which we sigh? “You have overcome him.” And whereby have they overcome? “Because greater is He that is in you, than he that is in this world.” Lest they should attribute the victory to their own strength, and by arrogance of pride should be overcome, (for whomsoever the devil makes proud, he overcomes,) wishing them to keep humility, what says he? “You have overcome him.” Every man now, at hearing this saying, “You have overcome,” lifts up the head, lifts up the neck, wishes himself to be praised. Do not extol yourself; see who it is that in you has overcome. Why have you overcome? “Because greater is He that is in you, than he that is in the world.” Be humble, bear your Lord; be the beast for Him to sit on. Good is it for you that He should rule, and He guide. For if you have not Him to sit on you, you may lift up the neck, may strike out the heels: but woe to you without a ruler, for this liberty sends you among the wild beasts to be devoured!
3. “These are of the world.” Who? The antichrists. You have already heard who they be. And if you be not such, you know them, but whosoever is such, knows not. “These are of the world: therefore speak they of the world, and the world hears them.” Who are they that “speak of the world”? Mark who are against charity. Behold, you have heard the Lord saying, “If you forgive men their trespasses, your heavenly Father will forgive you also your trespasses. But if you forgive not men their trespasses, neither will your Father forgive your trespasses.” It is the sentence of Truth: or if it be not Truth that speaks, gainsay it. If you are a Christian and believest Christ, He has said, “I am the truth.” This sentence is true, is firm. Now hear men that “speak of the world.” “And will you not avenge yourself? And will you let him say that he has done this to you? Nay: let him feel that he has to do with a man.” Every day are such things said, They that say such things, “of the world speak they, and the world hears them.” None say such things but those that love the world, and by none are such things heard but by those who love the world. And you have heard that to love the world and neglect charity is to deny that Jesus came in the flesh. Or say if the Lord Himself in the flesh did that? If, being buffeted, He willed to be avenged? If, hanging on the cross, He did not say, “Father, forgive them, for they know not what they do”? But if He threatened not, who had power; why do you threaten, why are you inflated with anger, who art under power of another? He died because it was His will to die, yet He threatened not; you know not when you shall die, and do you threaten?
4. “We are of God.” Let us see why; see whether it be for any other thing than charity. “We are of God: he that knows God hears us; he that is not of God hears not us. Hereby know we the spirit of truth, and of error:” namely by this, that he that hears us has the spirit of truth; he that hears not us, has the spirit of error. Let us see what he advises, and let us choose rather to hear him advising in the spirit of truth, and not antichrists, not lovers of the world, not the world. If we are born of God, “beloved,” he goes on— see above from what: “We are of God: he that knows God hears us; he that is not of God hears not us. Hereby know we the spirit of truth, and of error:” aye, now, he makes us eagerly attentive: to be told that he who knows God, hears; but he who knows not, hears not; and that this is the discerning between the spirit of truth and the spirit of error: well then, let us see what he is about to advise; in what we must hear him— “Beloved, let us love one another.” Why? Because a man advises? “Because love is of God.” Much has he commended love, in that he has said, “Is of God:” but he is going to say more; let us eagerly hear. At present he has said, “Love is of God; and every one that loves is born of God, and knows God. He that loves not knows not God.” Why? “For God is love” [Love is God]. What more could be said, brethren? If nothing were said in praise of love throughout the pages of this epistle, if nothing whatever throughout the other pages of the Scriptures, and this one only thing were all we were told by the voice of the Spirit of God, “For Love is God;” nothing more ought we to require.
Source: Homilies on the First Epistle of John (New Advent)