Progress has been much more general than retrogression

In my simplicity, I remember wondering why every gentleman did not become an ornithologist.

Sympathy for the lowest animals is one of the noblest virtues with which man is endowed.

Such simple instincts as bees making a beehive could be sufficient to overthrow my whole theory.

Some few, and I am one of them, even wish to God, though at the loss of millions of lives, that the North would proclaim a crusade against slavery. In the long-run, a million horrid deaths would be amply repaid in the cause of humanity. Great God! how I should like to see the greatest curse on earth - slavery - abolished!

It is not the most intellectual of the species that survives; it is not the strongest that survives; but the species that survives is the one that is able best to adapt and adjust to the changing environment in which it finds itself.

Light will be thrown on the origin of man and his history.