The brilliant and wise theoretical physicist not only gifted us with the theory of relatively and modern physics, he was also quite a philosopher.

Here are his best insights to inspire you to live your life with passion.

"The only source of knowledge is experience."

"The important thing is not to stop questioning. Curiosity has its own reason for existing."

"I have no special talent. I am only passionately curious."

"Imagination is everything. It is the preview of life’s coming attractions."

"The true sign of intelligence is not knowledge but imagination."

"Life is like riding a bicycle. To keep your balance you must keep moving."

"In the middle of difficulty lies opportunity."

"Everything should be made as simple as possible, but not simpler."

"There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle."

"Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid."

"A person who never made a mistake never tried anything new."

"Two things are infinite: the universe and human stupidity; and I’m not sure about the universe."