Everyone who has this hope set on him purifies himself, even as he is pure.

 John begins by demanding that his people should remember their privileges. It is their privilege that they are called the children of God. There is something even in a name. Chrysostom, in a sermon on how to bring up children, advises parents to give their boy some great scriptural name, to teach him repeatedly the story of the original bearer of the name, and so to give him a standard to live up to when he grows to manhood. So the Christian has the privilege of being called the child of God. Just as to belong to a great school, a great regiment, a great church, a great household is an inspiration to fine living, so, even more, to bear the name of the family of God is something to keep a man's feet on the right way and to set him climbing. 