John 13:35

(Hom. lxxii. 4) Passing over the miracles, which they were to perform, He makes love the distinguishing mark of His followers; By this shall all men know that ye are My disciples, if ye have love one to another. This it is that evidences the saint or the disciple, as He calls him.

"By this," He adds, "shall all men know that ye are my disciples, if ye have love one to another:" as if He said, Other gifts of mine are possessed in common with you by those who are not mine,-not only nature, life, perception, reason, and that safety which is equally the privilege of men and beasts; but also languages, sacraments, prophecy, knowledge, faith, the bestowing of their goods upon the poor, and the giving of their body to the flames: but because destitute of charity, they only tinkle like cymbals; they are nothing, and by nothing are they profited. It is not, then, by such gifts of mine, however good, which may be alike possessed by those who are not my disciples, but "by this it is that all men shall know that ye are my disciples, that ye have love one to another." O thou spouse of Christ, fair amongst women! O thou who ascendest in whiteness, leaning upon thy Beloved! for by His light thou art made dazzling to whiteness, by His assistance thou art preserved from falling. How well becoming thee are the words in that Song of Songs, which is, as it were, thy bridal chant, "That there is love in thy delights"! This it is that suffers not thy soul to perish with the ungodly; it is this that judges thy cause, and is strong as death, and is present in thy delights.

(Tr. lxv. 3) if He said, Other gifts are shared with you by those who are not mine; birth, life, sense, reason, and such good things as belong alike to man and brutes; nay, and tongues, sacraments, prophecy, knowledge, faith, bestowing of goods upon the poor, giving the body to be burned: but forasmuch as they have not charity, they are tinkling cymbals, they are nothing: nothing profits them.