The more success the quantum theory has, the sillier it looks

All our thinking is of this nature, a free play with concepts.

Concepts that have proven useful in ordering things easily achieve such authority over us that we forget their earthly origins and accept them as unalterable givens.

Even on the most solemn occasions I got away without wearing socks and hid that lack of civilization in high boots

You cannot simultaneously prevent and prepare for war.

Desire for approval and recognition is a healthy motive, but the desire to be acknowledged as better, stronger, or more intelligent than a fellow being or fellow scholar easily leads to an excessively egoistic psychological adjustment, which may become injurious for the individual and for the community.

Nationalism is the measels of mankind.