There is always the danger in all strong, erotic love that one may love what I might call the polyphony of life. What I mean is that God wants us to love him eternally with our whole hearts – not in such a way as to injure or weaken our earthly love, but to provide a kind of cantus firmus to which the other melodies of life provide the counterpoint…
Only a polyphony of this kind can give life a wholeness and at the same time assure us that nothing calamitous can happen as long as the cantus firmus is kept going.
Dietrich Bonhoeffer, Letters and Papers from Prison, The Enlarged Edition, ed. Eberhard Bethge, London, SCM Press, 1971.