Real sign of intelligence isn't knoweldge, it's imagination

Intuitive powers played a central role in my scientific work, not wild speculation, yet a valued resource when no other approach was available.

At present every coachman and every waiter argues about whether or not the relativity theory is correct.

Genius is 1% talent and 99% percent hard work.

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.

It is impossible to get anywhere without sinning against reason.

Curiosity is a delicate little plant that, aside from stimulation, stands mainly in need of freedom.