When Christianity becomes conscious of its innermost nature, it realizes that it is godliness rising our of inward constraint. The highest knowledge is to know that we are surrounded by mystery. Neither knowledge nor hope for the future can be the pivot of our life or determine its direction. It is intended to be solely determined by our allowing ourselves to be gripped by the ethical God, who reveals Himself in us, and by our yielding our will to His.

The Spiritual Life (1947)