It is difficult to believe in the dreadful but quiet war lurking just below the serene facade of nature. - Charles Darwin

About thirty years ago there was much talk that geologists ought only to observe and not theorise; and I well remember some one saying that at this rate a man might as well go into a gravel-pit and count the pebbles and describe the colours. How odd it is that anyone should not see that all observation must be for or against some view if it is to be of any service!

To admit that species generally become rare before they become extinct — to feel no surprise at the comparative rarity of one species with another, and yet to call in some extraordinary agent and to marvel greatly when a species ceases to exist, appears to me much the same as to admit that sickness in the individual is the prelude to death — to feel no surprise at sickness — but when the sick man dies to wonder, and to believe that he died through violence.

Self-portraits have the merit of disclosing the influences as well as the man. There may be some to whom the Autobiography will prove what Charles Darwin was not—a metaphysician or profound thinker beyond the scope of his world-wide subject. But no one can read his own words and fail to recognise a character of rare simplicity and complete integrity. The Autobiography shows how it was that he altered the whole course of Victorian thought, not by blazoning his discoveries nor by sudden iconoclasm, but rather through searching insight and pondered judgments opening up vast fields for further research.