The great tragedy of science - the slaying of a beautiful hypothesis by an ugly fact.

I'd rather have an ape for an ancestor than a bishop.

Deduction, which takes us from the general proposition to facts again-teaches us, if I may so say, to anticipate from the ticket what is inside the bundle.

Ecclesiasticism in science is only unfaithfulness to truth

As a natural process, of the same character as the development of a tree from its seed, or of a fowl from its egg, evolution excludes creation and all other kinds of supernatural intervention.

The man of science has learned to believe in justification, not by faith, but by verification.

What would become of the garden if the gardener treated all the weeds and slugs and birds and trespassers as he would like to be treated, if he were in their place?