Gravitation is not responsible for people falling in love.
The most beautiful experience we can have is the mysterious - the fundamental emotion which stands at the cradle of true art and true science.
Creativity is intelligence having fun.
If you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.
Black holes are where God divided by zero.
It is not that I'm so smart. But I stay with the questions much longer.
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.
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 best way to cheer yourself is to cheer somebody else up.
Everything must be made as simple as possible. But not simpler.