I have written to you, fathers, because you know him who is from the beginning. I have written to you, young men, because you are strong, and the word of God remains in you, and you have overcome the evil one.

 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. 