Charles Robert Darwin

A scientific man ought to have no wishes, no affections, - a mere heart of stone

Animals, whom we have made our slaves, we do not like to consider our equal

We will now discuss in a little more detail the struggle for existence

The very essence of instinct is that it's followed independently of reason

A man's friendships are one of the best measures of his worth.

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

The universe we observe has precisely the properties we should expect if there is, at bottom, no design, no purpose, no evil, no good, nothing but blind, pitiless indifference

All of nature is a battlefield

I am not the least afraid to die

How paramount the future is to the present when one is surrounded by children

It is so easy to hide our ignorance under such expressions as the 'plan of creation,' 'unity of design,' etc..

In the survival of favoured individuals and races, during the constantly-recurring struggle for existence, we see a powerful and ever-acting form of selection

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

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

I love fools' experiments. I am always making them

A moral being is one who is capable of reflecting on his past actions and their motives - of approving of some and disapproving of others

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

To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact

At some future period, not very distant as measured by centuries, the civilized races of man will almost certainly exterminate, and replace the savage races throughout the world