Brothers, I write no new commandment to you, but an old commandment which you had from the beginning. The old commandment is the word which you heard from the beginning.

 (iii) Lastly, there was the Jewish way of knowing God which is closely allied with the Christian way. To the Jew knowledge of God came, not by man's speculation or by an exotic experience of emotion, but by God's own revelation. The God who revealed himself was a holy God and his holiness brought the obligation to his worshipper to be holy, too. A. E. Brooke says, "John can conceive of no real knowledge of God which does not issue in obedience." Knowledge of God can be proved only by obedience to God; and knowledge of God can be gained only by obedience to God. C. H. Dodd says, "To know God is to experience his love in Christ, and to return that love in obedience." 