And now He teaches them how to fit themselves to follow Him: A new commandment I give unto you, that ye love one another. (Levit. 19:18) But does not the old law say, Thou shall love thy neighbour as thyself? Why then does He call it a new commandment? Is it because it strips us of the old man, and puts on us the new? That it renews the hearer, or rather the doer of it? Love does do this; but it is that love which our Lord distinguishes from the carnal affection: As I have loved you, that ye also love one another. Not the love with which men love one another, but that of the children of the Most High God, who would be brethren of His only-begotten Son, and therefore love one another with that love with which He loved them, and would lead them to the fulfilment of their desires.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Tr. lxv. 1