We are not here concerned with hopes or fears, only with truth as far as our reason permits us to discover it.

We feel surprise when travellers tell us of the vast dimensions of the Pyramids and other great ruins, but how utterly insignificant are the greatest of these, when compared to these mountains of stone accumulated by the agency of various minute and tender animals!

Nature will tell you a direct lie if she can.

I would give absolutely nothing for the theory of Natural Selection, if it requires miraculous additions at any one stage of descent.

He who understands baboon would do more towards metaphysics than Locke.

A grain in the balance will determine which individual shall live and which shall die - which variety or species shall increase in number, and which shall decrease, or finally become extinct.

...one doubts existence of free will [because] every action determined by heredity, constitution, example of others or teaching of others." "This view should teach one profound humility, one deserves no credit for anything...nor ought one to blame others.