One cannot deal with a problem with the same thinking that creates it.

The only reason for time is so that everything doesn't happen at once.

I have never belonged wholeheartedly to a country, a state, nor to a circle of friends, nor even to my own family. When I was still a rather precocious young man, I already realized most vividly the futility of the hopes and aspirations that most men pursue throughout their lives. Well-being and happiness never appeared to me as an absolute aim. I am even inclined to compare such moral aims to the ambitions of a pig.

On the other hand, the concept owes its meaning and its justification exclusively to the totality of the sense impressions which we associate with it.

If I were not a physicist, I would probably be a musician. I often think in music. I live my daydreams in music. I see my life in terms of music.

Falling in love is not at all the most stupid thing that people do - but gravitation cannot be held responsible for it.

Children don’t heed the life experiences of their parents, and nations ignore history. Bad lessons always have to be learned anew.