The greatest discovery of all time is that a person can chan... - William James

"The greatest discovery of all time is that a person can change his future by merely changing his attitude."

William James Happiness

Psychologist, Philosopher American 1842–1910

More from William James

"The greatest discovery of my generation is that human beings can alter their lives by altering their attitudes of mind."

"Act as if what you do makes a difference. It does."

"The only way out is through."

"Does consciousness exist? I say yes."

"Babalú!"

"My greatest joy is making people smile."

"Laughter and love make a home."

"The best things in life are free."