On the ostensible exactitude of certain branches of human knowledge, including mathematics. The exactness is a fake.

The great achievements of the past were the adventures of the past. Only the adventurous can understand the greatness of the past.

No religion can be considered in abstraction from its followers, or even from its various types of followers.

I consider Christian theology to be one of the great disasters of the human race.

One main factor in the upward trend of animal life has been the power of wandering.

In the history of the world the prize has not gone to those species which specialized in methods of violence, or even in defensive armor. In fact, nature began with producing animals encased in hard shells for defense against the ill of life. But smaller animals, without external armor, warm-blooded, sensitive, alert, have cleared those monsters off the face of the earth.

Art flourishes where there is a sense of adventure, a sense of nothing having been done before, of complete freedom to experiment.