We do not take humor seriously enough..

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

The instinctive need to be the member of a closely knit group fighting for common ideals may grow so strong that it becomes inessential what these id….

One of the most dangerously vicious circles menacing the continued existence of all mankind arises through that grim striving for the highest possibl….

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

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

The human soul is very much older than the human mind..

Historians will have to face the fact that natural selection determined the evolution of cultures in the same manner as it did that of species..

The attitude of the true scientist towards the real limits of human understanding was unforgettably impressed on me in early youth by the obviously u….

The cat is a wild animal that inhabits the homes of humans..

Scientific truth is universal, because it is only discovered by the human brain and not made by it, as art is..

A man sufficiently gifted with humor is in small danger of succumbing to flattering delusions about himself, because he cannot help perceiving what a….

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

Every man gets a narrower and narrower field of knowledge in which he must be an expert in order to compete with other people. The specialist knows m….

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

All the advantages that man has gained from his ever-deepening understanding of the natural world that surrounds him, his technological, chemical and….