Dale Carnegie, How to Win Friends and Influence People

"A man convinced against his will Is of the same opinion still"

"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."

"Don't be afraid of enemies who attack you. Be afraid of the friends who flatter you."

"Don't be afraid of enemies who attack you. Be afraid of the friends who flatter you."

"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."

"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 it."

"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 it."

"If you argue and rankle and contradict, you may achieve a victory sometimes; but it will be an empty victory because you will never get your opponent's good will."

"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 it."