I write to you, fathers, because you know him who is from the beginning. I write to you, young men, because you have overcome the evil one. I write to you, little children, because you know the Father.

 The commandment to love was old in the sense that men had known of it for long; but it was new because in Jesus Christ love had reached a standard which it had never reached before and it was by that standard that men were bidden to love. 