A passage from W.H. Auden’s posthumously published The Prolific and the Devourer, which comes to us via the inestimable Matthew Sitman:

Both in the substance and the parabolic method of his teaching about love, Jesus never asks anyone to accept anything except on the basis of their personal experience of human love. In using the terms Father and Son to express the relation of the divine and the human, rather than, say King and subject, he makes the relation a physical not an intellectual one, for it is precisely because in the relation of parent and child the physical material relation is so impossible to deny, that it is so difficult for a human parent not to love their children irrespective of moral judgment. They can do so, but it is very much more difficult for them than for those who have not such an obvious physical connection.

Jesus in fact is asserting what the psychologists have confirmed: that one does in fact always conceive of one’s relations with life in terms of one’s relations with one’s parents, and in proportion as these were bad, one’s attitude to life is distorted [ed. note: see video below]. But though parental love is often imperfect, it is good enough and often enough for us to have no doubt about what it should be like. We expect parents to love their children whether they act well or badly because it is our experience that they usually do: we expect a physical relation to override morals. In speaking of the fatherhood of God, Jesus is teaching that God does not love us because we are ‘good’ or because he is very ‘good’ and merciful but because he has to, because we are part of him, and he can no more hate us if we act badly than a man can hate one of its fingers when it aches: he can only want it to get well.