Who said “It isn't enough to talk about peace. One must believe in it. And it isn't enough to…”?

“First we have to believe, and then we believe.”

“In order to succeed, we must first believe that we can.”

“We are born believing. A man bears beliefs as a tree bears apples.”

“As a rule we disbelieve all the facts and theories for which we have no use.”

“Many a time I have wanted to stop talking and find out what I really believed.”

“Happiness is not a goal, it is a by-product.”

“If life were predictable it would cease to be life, and be without flavor.”

“Life was meant to be lived, and curiosity must be kept alive. One must never, for whatever reason, turn his back on life.”

“I think, at a child's birth, if a mother could ask a fairy godmother to endow it with the most useful gift, that gift would be curiosity.”

“The purpose of life...is to live it, to taste experience to the utmost, to reach out eagerly and without fear for newer and richer experience.”

“Understanding is a two-way street.”