Do not become a man who is successful. Try to become a man of value.
An empty stomach is not a good political advisor.
Equations are more important to me, because politics is for the present, but an equation is something for eternity.
Your imagination is your preview of life's coming attractions.
Only a life lived for others is worth living.
The important thing is not to stop questioning.
The secret of creativity is knowing how to hide your sources.
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.
A person who never made a mistake never tried anything new.
Life is like riding a bicycle; in order to keep your balance, you must keep moving.