Can be drawn between the animal world and ourselves

Extinguished theologians lie about the cradle of every science as the strangled snakes beside that of Hercules

A man has no reason to be ashamed of having an ape for his grandfather.

I cannot but think that he who finds a certain proportion of pain and evil inseparably woven up in the life of the very worms, will bear his own share with more courage and submission

To a person uninstructed in natural history, his country or sea-side stroll is a walk through a gallery filled with wonderful works of art, nine-tenths of which have their faces turned to the wall.

But orthodoxy is the Bourbon of the world of thought.

Life is too short to occupy oneself with the slaying of the slain more than once.