Not one great country can be named, from the polar regions in the north to New Zealand in the south, in which the aborigines do not tattoo themselves.

Why, if species have descended from other species by insensibly fine gradations, do we not everywhere see innumerable transitional forms.

The impossibility of conceiving that this grand and wondrous universe, with our conscious selves, arose through chance, seems to me the chief argument for 
the existence of God.

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

Besides love and sympathy, animals exhibit other qualities connected with the social instincts which in us would be called moral.

It may be said that natural selection is daily and hourly scrutinizing, throughout the world, every variation, even the slightest; rejecting that which is bad, preserving and adding up all that is good; silently and insensibly working, wherever and whenever opportunity offers, at the improvement of each organic being in relation to its organic and inorganic conditions of life.

Attention, if sudden and close, graduates into surprise; and this into astonishment; and this into stupefied amazement.