We appropriate from Judaism everything connected with promises, promises for this life; we teach that like a Jew one is to pursue them, and, like a Jew, to see the proof of God's grace in the fact that one is rich, happily married, blessed in an earthly sense. And if this fails, then we take the other dose - Christianity's promise for eternity. and this mixture is Christianity! We complete forget that Christianity's promise of eternity is glowing because it requires such a complete forsaking of temporality, and further, that Christianity teaches specifically that to suffer in the temporal is the very mark of God's grace. We forget that Judaism's conception of eternity was weak because it promised so much in this life. (Kierkegaard, Journals and Papers, 1:843)
Kierkegaard never ceases to challenge.