The highest wisdom has but one science - the science of the whole - the science explaining the whole creation and man's place in it.

Blushing is the most peculiar and most human of all expressions.

False facts are highly injurious to the progress of science, for they often endure long; but false views, if supported by some evidence, do little harm, for every one takes a salutary pleasure in proving their falseness.

The great variability of all the external differences between the races of man, likewise indicates that they cannot be of much importance; for if important, they would long ago have been either fixed and preserved, or eliminated.

I believe there exists, & I feel within me, an instinct for the truth, or knowledge or discovery, of something of the same nature as the instinct of virtue, & that our having such an instinct is reason enough for scientific researches without any practical results ever ensuing from them.

Man, wonderful man, must collapse, into nature's cauldron, he is no deity, he is no exception.