If you can't explain it simply, you don't understand it well enough.
Life is like riding a bicycle; in order to keep your balance, you must keep moving.
A person who never made a mistake never tried anything new.
A man sits with a pretty girl for an hour and it seems shorter than a minute. But tell that same man to sit on a hot stove for a minute, it is longer than any hour. That's relativity.
The secret of creativity is knowing how to hide your sources.
The important thing is not to stop questioning.
Insanity: doing the same thing over and over again and expecting different results.
Only a life lived for others is worth living.
Your imagination is your preview of life's coming attractions.
Do not become a man who is successful. Try to become a man of value.