Charles Darwin

Delight itself, however, is a weak term to express the feelings of a naturalist.

In the long history of humankind (and animal kind, too) those who learned to collaborate and improvise most effectively have prevailed.

"In the struggle for survival, the fittest win out at the expense of their rivals because they succeed in adapting themselves best to their environment."

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

It is not the strongest of the species that survives, nor the most intelligent, but the one most responsive to change.

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

Even in the worm that crawls in the earth there glows a divine spark. When you slaughter a creature, you slaughter God.

We will now discuss in a little more detail the Struggle for Existence.

The expression often used by Mr. Herbert Spencer of the Survival of the Fittest is more accurate, and is sometimes equally convenient.

The highest possible stage in moral culture is when we recognize that we ought to control our thoughts.