When men are most sure and arrogant they are commonly most mistaken, giving views to passion without that proper deliberation which alone can secure them from the grossest absurdities
David Hume
Never mistake motion for action.
Ernest Hemingway
The most exciting phrase to hear in science, the one that heralds new discoveries, is not ‘Eureka’ (I found it!) but ‘That’s funny…’
Isaac Asimov
An expert is a person who has made all the mistakes that can be made in a very narrow field.
Niels Bohr
Flaming enthusiasm, backed up by horse sense and persistence, is the quality that most frequently makes for success.
Dale Carnegie
“Alexander Hamilton started the U.S. Treasury with nothing, and that was the closest our country has ever been to being even. “Â
 Will Rogers
“Two things are infinite: the universe and human stupidity; and I’m not sure about the the universe.”  Â
Albert Einstein
“It isn’t what we don’t know that gives us trouble, it’s what we know that ain’t so.”Â
Will Rogers
Reason and judgment are the qualities of a leader.
-Tacitus