Mark Twain is often quoted as having said, "It ain't what you don't know that gets you into trouble, it's what you know for sure that just ain't so."

Frederick Douglass once said: Any man may say things that are true of Abraham Lincoln, but no man can say anything that is new of Abraham Lincoln. If that were true in the past century, in the early seventies, how much more is it true today

Mark Twain once said, “It’s not what we don’t know that gets us in trouble. It’s what we know for sure that just ain’t so.

He had only one vanity; he thought he could give advice better than any other person.

If the last to know he’s an addict is the addict, then maybe the last to know when a man means what he says is the man himself, he reflected.

Though old the thought and oft exprest,
'Tis his at last who says it best.

A man of worth never gets up to unsay what he said yesterday.

The secret of his success? “I will speak ill of no man,” he said, “. . and speak all the good I know of everybody.

Mark Twain once said he knew he was a successful author when Kaiser Wilhelm II said he’d read every Twain book, and later that day a porter at his hotel said the same. “Great books are wine,” Twain said, “but my books are water. But everybody drinks water.” He found the universal emotions that influence everyone, regardless of who they were or where they were from, and got them to nod their heads in the same direction. It’s nearly magic. Guiding people’s attention to a single point is one of the most powerful life skills.

Who was it who said that a wise man speaks when he has something to say, but a fool speaks because he must?

Just when the gods had ceased to be, and the Christ had not yet come, there was a unique moment in history, between Cicero and Marcus Aurelius, when man stood alone.

Well, he used to say that only a lie that wasn't ashamed of itself could possibly succeed. He also said that nothing had to be true, but everything had to sound true.

An honest man's word is as good as his bond.

One man will say a thing of himself without comprehending its excellence, in which another will discern a marvelous series of conclusions, which makes us affirm that it is no longer the same expression, and that he is no more indebted for it to the one from whom he has learned it, than a beautiful tree belongs to the one who cast the seed, without thinking of it, or knowing it, into the fruitful soil which caused its growth by its own fertility.