Variant: It isn't what you have, or who you are, or where you are, or what you are doing that makes you happy or unhappy. It is what you think about.
Source: How to Win Friends and Influence People

“Any fool can criticize, condemn and complain - and most fools do. But it takes character and self-control to be understanding and forgiving.”

Dale Carnegie How to Win Friends and Influence People

Part 1 : Fundamental Techniques in Handling People, p. 36.
Source: How to Win Friends and Influence People (1936)
Context: Benjamin Franklin, tactless in his youth, became so diplomatic, so adroit at handling people that he was made American Ambassador to France. The secret of his success? "I will speak ill of no man," he said, "... and speak all the good I know of everybody." Any fool can criticize, condemn and complain - and most fools do. But it takes character and self-control to be understanding and forgiving. "A great man shows his greatness," says Carlyle, "by the way he treats little men."

“When dealing with people, remember you are not dealing with creatures of logic, but with creatures bristling with prejudice and motivated by pride and vanity.”

Dale Carnegie How to Win Friends and Influence People

Variant: When dealing with people, let us remember we are not dealing with creatures of logic. We are dealing with creatures of emotion, creatures bristling with prejudices and motivated by pride and vanity.
Source: How to Win Friends and Influence People

“The ideas I stand for are not mine. I borrowed them from Socrates. I swiped them from Chesterfield. I stole them from Jesus. And I put them in a book. If you don't like their rules whose would you use?”

Dale Carnegie

On his book How to Win Friends and Influence People as quoted in Newsweek (8 August 1955); also quoted in Best Quotes of '54, '55, '56 (1957) by James Beasley Simpson, p. 128.

“Most of the important things in the world have been accomplished by people who have kept on trying when there seemed to be no hope at all.”

Dale Carnegie

As quoted in The Ring of Truth (2004) by Joseph O'Day

“When we hate our enemies, we are giving them power over us: power over our sleep, our appetites, our blood pressure, our health, and our happiness.”

Dale Carnegie book How to Stop Worrying and Start Living

Source: How to Stop Worrying and Start Living (1948), p. 110

“Everybody in the world is seeking happiness—and there is one sure way to find it. That is by controlling your thoughts. Happiness doesn't depend on outward conditions. It depends on inner conditions.”

Dale Carnegie How to Win Friends and Influence People

Source: How to Win Friends and Influence People

“People rarely succeed unless they have fun in what they are doing.”

Dale Carnegie

Dale Carnegie, quoted in Permission to Play : Taking Time to Renew Your Smile (2003) by Jill Murphy Long, p. 69