Our descent, then, is the origin of our evil passions!! The devil under form of Baboon is our grandfather.

On your life, underestimating the proclivities of finches is likely to lead to great internal hemorrhaging.

I am a firm believer, that without speculation there is no good and original observation.

Everything in nature is the result of fixed laws.

The loss of these tastes [for poetry and music] is a loss of happiness, and may possibly be injurious to the intellect, and more probably to the moral character, by enfeebling the emotional part of our nature.

It appears to me (whether rightly or wrongly) that direct arguments against Christianity and theism produce hardly any effect on the public; and freedom of thought is best promoted by the gradual illumination of men's minds, which follows from the advance of science.

If man had not been his own classifier, he would never have thought of founding a separate order for his own reception.