The more we know, the better we realize that our knowledge is a little island in the midst of an ocean of ignorance.

Nothing in biology makes sense except in the light of evolution.

Does the evolutionary doctrine clash with religious faith? It does not. It is a blunder to mistake the Holy Scriptures for elementary textbooks of astronomy, geology, biology, and anthropology.

Natural selection must be replaced by eugenical artificial selection. This idea constitutes the sound core of eugenics, the applied science of human betterment.

The living world is not a single array... connected by unbroken series of intergrades.

No evidence is powerful enough to force acceptance of a conclusion that is emotionally distasteful.

Nature's stern discipline enjoins mutual help at least as often as warfare. The fittest may also be the gentlest.

Scientists often have a naive faith that if only they could discover enough facts about a problem, these facts would somehow arrange themselves in a compelling and true solution.

Pat answers to complex problems are the hallmark of intellectual mediocrity

No known human group... simply throw out its dead without any ritual or ceremony. In stark contrast, no animal practices burial of dead individuals of its own species.

An accident, a random change, in any delicate mechanism can hardly be expected to improve it. Poking a stick into the machinery of one's watch or one's radio set will seldom make it work better.

Do the thing you fear the most and the death of fear is certain.

Cultivate balance. After all, there's no such thing as a shadow without the involvement of light.

We are involved in a life that passes understanding: our highest business is our daily life.

I hope I inspire people who hear. Hearing people have the ability to remove barriers that prevent deaf people from achieving their dreams.

Define yourself or be defined.

I think that the thing that we learned back in the day of the Civil Rights Movement is that you do have to keep on keeping on.

If we are ever going to save this society and the world, there has got to be a way for us to work together. That may be more than we can ever hope to achieve, just because of human nature.

You cannot be sure that you are right unless you understand the arguments against your views better than your opponents do.

The other day I dreamed that I was at the gates of heaven. And St. Peter said, 'Go back to Earth, there are no slums up here.'

To the question: How do the authors of sketches, stories and novels get along in life, the following answer can or must be given: They are stragglers and they are down at heel.