"'When that which is perfect is come, then that which is in part shall be done away' (I Corinthians 13:10). The idea of reaching 'a good life' without Christ is based on a double error. Firstly, we cannot do it; and secondly, in setting up 'a good life' as our final goal, we have missed the very point of our existence. Morality is a mountain which we cannot climb by our own efforts; and if we could we should only perish in the ice and unbreathable air of the summit, lacking those wings with which the rest of the journey has to be accomplished. For it is from there that the real ascent begins. The ropes and axes are 'done away' and the rest is a matter of flying."
From the essay 'Man or Rabbit?', published in 1946, found today in God in the Dock