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

“Suspicion of happiness is in our blood.”

“Happiness is not pleasure, it is victory.”

“To be happy we must not be too concerned with others.”

“Happiness makes up in height for what it lacks in length.”

“He's simply got the instinct for being unhappy highly developed.”

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

“It isn't enough to talk about peace. One must believe in it. And it isn't enough to believe in it. One must work at it.”

“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.”