Divine filiation is the basis of the spirit of Opus Dei. All men are children of God. But a child can look upon his father in many ways. We must try to be children who realize that the Lord, by loving us as his children, has taken us into his house, in the middle of the world, to be members of his family, so that what is his is ours, and what is ours is his, and to develop that familiarity and confidence which prompts us to ask him, like children, for the moon!
A child of God treats the Lord as his Father. He is not obsequious and servile, he is not merely formal and well-mannered: he is completely sincere and trusting. Men do not scandalize God. He can put up with all our infidelities. Our Father in heaven pardons any offence when his child returns to him, when he repents and asks for pardon. The Lord is such a good Father that he anticipates our desire to be pardoned and comes forward to us, opening his arms laden with grace.
Now I'm not inventing anything. Remember the parable which Jesus told to help us understand the love of our Father who is in heaven: the parable of the prodigal son . “But while he was still a long way off, his father saw him and took pity on him; running up, he threw his arms around his neck and kissed him" . That's what the sacred text says: he covered him with kisses. Can you put it more humanly than that? Can you describe more graphically the paternal love of God for men? (Christ is passing by, 64)
 Cf Luke 15:11 ff
 Luke 15:20