The mind can proceed only so far upon what it knows and can prove. There comes a point where the mind takes a higher plane of knowledge, but can never prove how it got there. All great discoveries have involved such a leap

Great spirits have always found violent opposition from mediocre minds. The latter cannot understand it when a man does not thoughtlessly submit to hereditary prejudices but honestly and courageously uses his intelligence.

You believe in a God who plays dice, I in complete law and order.

A little knowledge is a dangerous thing. So is a lot.

I am neither especially clever nor especially gifted. I am only very, very curious.

Life is sacred, that is to say, it is the supreme value, to which all other values are subordinate.

Those who manage their way into a crisis are not necessarily the right people to manage their way out of a crisis