Charles Darwin

Why does man regret, even though he may endeavour to banish any such regret, that he has followed the one natural impulse, rather than the other; and why does he further feel that he ought to regret his conduct? Man in this respect differs profoundly from the lower animals.

Charles Darwin

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

Charles Darwin

With highly civilised nations continued progress depends in a subordinate degree on natural selection; for such nations do not supplant and exterminate one another as do savage tribes.

Charles Darwin

With mammals the male appears to win the female much more through the law of battle than through the display of his charms.

Charles Darwin

Worms have played a more important part in the history of the world than humans would at first suppose.

Charles Darwin

You will be astonished to find how the whole mental disposition of your children changes with advancing years. A young child and the same when nearly grown, sometimes differ almost as much as do a caterpillar and butterfly.

Charles Darwin