Abraham Lincoln

"It is better to remain silent and be thought a fool than to open one's mouth and remove all doubt. "

"Am I not destroying my enemies when I make friends of them?"

"Give me six hours to chop down a tree and I will spend the first four sharpening the axe. "

"How many legs does a dog have if you call the tail a leg? 
Four. Calling a tail a leg doesn't make it a leg."

"Most folks are as happy as they make up their minds to be." 

"No man has a good enough memory to be a successful liar."

"No matter how much cats fight, there always seem to be plenty of kittens."

"Tact is the ability to describe others as they see themselves."

"The best thing about the future is that it comes one day at a time"

"The things I want to know are in books; my best friend is the man who'll get me a book I ain't read."

"What kills a skunk is the publicity it gives itself."

"Whatever you are, be a good one."

"When you have got an elephant by the hind legs and he is trying to run away, it's best to let him run."

"You can fool all the people some of the time, and some of the people all the time, but you cannot fool all the people all the time.