"This is my simple religion. There is no need for temples; no need for complicated philosophy. Our own brain, our own heart is our temple; the philosophy is kindness."

"Ita€?s a wonder man can eat at all, when things are big that should be small."

"'We are survival machines - robot vehicles blindly programmed to preserve the selfish molecules known as genes."

"The work goes on, the cause endures, the hope still lives and the dreams shall never die."

"The only thing worse than losing a battle is winning one"

"There is only one sin. That is weakness.... The only saint is that soul that never weakens, faces everything, and determines to die game."

"Most of our obstacles would melt away if, instead of cowering before them, we should make up our minds to walk boldly through them."

"There is always a well-known solution to every human problem--neat, plausible, and wrong."

"All growth is a leap in the dark, a spontaneous unpremeditated act without the benefit of experience."

"Science is organized knowledge."