The world is passing away with its lusts, but he who does God's will remains forever.

 John goes on to say that this commandment of love is true in Jesus Christ and true in the people to whom he is writing. To John, as we have seen, truth was not only something to be grasped with the mind; it was something to be done. What he means is that the commandment to love one another is the highest truth; in Jesus Christ we can see that commandment in all the glory of its fullness; in him that commandment is true; and in the Christian we can see it, not in the fullness of its truth but coming true. For John, Christianity is progress in love. 