Charles Darwin

The subject [of evolution] haunted me.

I cannot be contented to view this wonderful universe, and especially the nature of man, and to conclude that everything is the result of brute force.

Man in his arrogance thinks himself a great work, worthy the interposition of a deity. More humble and, I believe, true to consider him created from animals.

I feel most deeply that this whole question of Creation is too profound for human intellect. A dog might as well speculate on the mind of Newton.

The survival or preservation of certain favoured words in the struggle for existence is natural selection.

I am not the least afraid to die.