12 Whence begins charity, brethren? Attend a little: to what it is perfected, you have heard; the very end of it, and the very measure of it is what the Lord has put before us in the Gospel: “Greater love has no man,” says He, “than that one lay down his life for his friends.” Its perfection, therefore, He has put before us in the Gospel, and here also it is its perfection that is put before us: but you ask yourselves, and say to yourselves, When shall it be possible for us to have “this” charity?
Do not too soon despair of yourself. Haply, it is born and is not yet perfect; nourish it, that it be not choked. But you will say to me, And by what am I to know it? For to what it is perfected, we have heard; whence it begins, let us hear. He goes on to say: “But whoso has this world's good, and sees his brother have hunger, and shuts up his bowels of compassion from him, how can the love of God dwell in him?” Lo, whence charity begins withal! If you are not yet equal to the dying for your brother, be even now equal to the giving of your means to your brother.
Even now let charity smite your bowels, that not of vainglory you should do it, but of the innermost marrow of mercy; that you consider him, now in want. For if your superfluities you can not give to your brother, can you lay down your life for your brother? There lies your money in your bosom, which thieves may take from you; and though thieves do not take it, by dying you will leave it, even if it leave not you while living: what will you do with it? Your brother hungers, he is in necessity: belike he is in suspense, is distressed by his creditor: he is your brother, alike you are bought, one is the price paid for you, you are both redeemed by the blood of Christ: see whether you have mercy, if you have this world's means.
Perchance you say, “What concerns it me? Am I to give my money, that he may not suffer trouble?” If this be the answer your heart makes to you, the love of the Father abides not in you. If the love of the Father abide not in you, you are not born of God. How do you boast to be a Christian? You have the name, and hast not the deeds. But if the work shall follow the name, let any call you pagan, show by deeds that you are a Christian. For if by deeds you do not show yourself a Christian, all men may call you a Christian yet; what does the name profit you where the thing is not forthcoming?
“But whoso has this world's good, and sees his brother have need, and shuts up his bowels of compassion from him, how can the love of God dwell in him?” And then he goes on: “My little children, let us not love in word, neither in tongue but in deed and in truth.”
Source: Homilies on the First Epistle of John (New Advent)