Thought is the organizing factor in man, intersected between the causal primary instincts and the resulting actions.

The indifference, callousness and contempt that so many people exhibit toward animals is evil first because it results in great suffering in animals, and second because it results in an incalculably great impoverishment of the human spirit.

Innovation is not the product of logical thought, even though the final product is tied to a logical structure.

We have to do the best we are capable of. This is our sacred human responsibility.

It is not a lack of real affection that scares me away again and again from marriage. Is it a fear of the comfortable life, of nice furniture, of dishonor that I burden myself with, or even the fear of becoming a contented bourgeois.

If one tries to navigate unknown waters one runs the risk of shipwreck

No scientist thinks in formulae.