I have written many things in my earlier books which I now wish I had never written. Time has forced me to revise beliefs, impressions, estimates, and even principles. I was misled by others in some cases and went astray through my own defects in others. Again and again dark moods have come over me solely because of past mistakes. They have often caused me unhappy moments. Nevertheless, compensation creeps in now and then despite myself. For as a scientific friend at the University of Cambridge, who sees the white as well as black in them reminds me, the essence of these books is a true one, their general effect is a valuable one, and their contribution is a necessary one in these times. And, moreover, they are perhaps the most important contents, after all. If I have done nothing more than to affirm certain unalterable verities, such as the existence of man's divine soul, and to show a way to the discovery thereof, I have done something that has made many people happier and my writing has not been quite pointless. That is the credit which may balance my debits.
-- Notebooks Category 12: Reflections > Chapter 5: The Literary Work > # 149