When you trip over love, it is easy to get up. But when you fall in love, it is impossible to stand again.
Everything must be made as simple as possible. But not simpler.
The measure of intelligence is the ability to change.
The best way to cheer yourself is to cheer somebody else up.
If A is a success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut
The world is a dangerous place to live, not because of the people who are evil, but because of the people who don't do anything about it.
It is not that I'm so smart. But I stay with the questions much longer.
Black holes are where God divided by zero.
Creativity is intelligence having fun.
The most beautiful experience we can have is the mysterious - the fundamental emotion which stands at the cradle of true art and true science.