Truth in science can be defined as the working hypothesis best suited to open the way to the next better one.

Humor and knowledge are the two great hopes of our culture.

More than any other product of human scientific culture scientific knowledge is the collective property of all mankind.

All the advantages that man has gained from his ever-deepening understanding of the natural world that surrounds him, his technological, chemical and medical progress, all of which should seem to alleviate human suffering... tends instead to favor humanity's destruction.

The bond with a dog is as lasting as the ties of this earth can ever be.

A man sufficiently gifted with humor is in small danger of succumbing to flattering delusions about himself, because he cannot help perceiving what a pompous ass he would become if he did.

The neuro-physiological organization which we call instinct functions in a blindly mechanical way, particularly apparent when its function goes wrong.