The truly staggering answer which the Bible gives to this question is that God's purpose in revelation is to make friends with us. It was to this end that he created us rational beings, bearing his image, able to think and hear and speak and love; he wanted there to be genuine personal affection and friendship, two-sided, between himself and us; a relationship not like that between a man and his dog, but like that of a father to his son, or a husband to his wife. Loving friendship between two persons has no ulterior motive; it is an end in itself. And this is God's end in revelation. He speaks to us simply to fulfill the purpose for which we were made; that is, to bring into being a relationship in which he is a friend to us, and we to him, he finding his joy in giving us gifts and we finding ours in giving him thanks. JI - Packer