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.

All scientific knowledge to which man owes his role as master of the world arose from playful activities.

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

We had better dispense with the personification of evil, because it leads, all too easily, to the most dangerous kind of war: religious war.

There is no faith which has never yet been broken, except that of a truly faithful dog

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

Philosophers are people who know less and less about more and more, until they know nothing about everything. Scientists are people who know more and more about less and less, until they know everything about nothing.