Zen abhors repetition or imitation of any kind, for it kills. For the same reason Zen never explains, but only affirms. Life is fact and no explanation is necessary or pertinent. To explain is to apologize, and why should we apologize for living? To live—is that not enough? Let us then live, let us affirm! Herein lies Zen in all its purity and in all its nudity as well.

An Introduction to Zen Buddhism (ed. 1949)