The hardest thing in the world to understand is the income tax.

My life is a simple thing that would interest no one. It is a known fact that I was born and that is all that is necessary.

Imagination is more important than knowledge.

Science is a wonderful thing if one does not have to earn one's living at it.

If A equals success, then the formula is: A = X+Y+Z. X is work. Y is play. Z is keep your mouth shut.

Few are those who see with their own eyes and feel with their own hearts.

 When the solution is simple, God is answering.

 Gravitation can not be held responsible for people falling in love

Only a life lived for others is worth living.

Common sense is a collection of prejudices acquired by the age of 18.