Not one change of species into another is on record ... we cannot prove that a single species has been changed.

The love for all living creatures is the most noble attribute of man.

A man who dares to waste one hour of time has not discovered the value of life.

The world will not be inherited by the strongest, it will be inherited by those most able to change.

Nothing exists for itself alone, but only in relation to other forms of life

Building a better mousetrap merely results in smarter mice.

A mathematician is a blind man in a dark room looking for a black cat which isn't there.

An American monkey, after getting drunk on brandy, would never touch it again, and thus is much wiser than most men.

It is not the biggest, the brightest or the best that will survive, but those who adapt the quickest.

We can allow satellites, planets, suns, universe, nay whole systems of universes, to be governed by laws, but the smallest insect, we wish to be created at once by special act.

What a book a devil's chaplain might write on the clumsy, wasteful, blundering, low, and horribly cruel work of nature!

Marriage is love put to it's ultimate test - the grindstone of life. Where the idealism of love meets the everydayness of marriage.

On the hot, fragrant afternoon of my graduation from college it seemed that good fortune was not merely latent but unavoidable, folded and in the bag.

The greatest discovery of my generation is that man can alter his life simply by altering his attitude of mind.

It's not pressure. It's responsibility We put it on ourselves.

I can never be safe; I always try and go against the grain. As soon as I accomplish one thing, I just set a higher goal. That's how I've gotten to where I am.

My parents are highly evolved worriers. ... If worrying were an Olympic sport, my parents' faces would have graced the Wheaties box a long time ago.

It is the end of happiness and the beginning of peace.

Sin always seems 'good, and pleasant, and desirable,' at the time of commission.

[I believe in the] rebuilding of Judea as an independent nation.

All the old houses that I knew when I was a child were full of books, bought generation after generation by members of the family. Nobody told you to read this or not to read that.