I hope and believe my co-religionists understand and admit that I disclaim their theology in toto, and that by no twisting of language or darkening of its meanings can I be made to have any thing whatever in common with them about religious matters... they must take my word for it that there is nothing in common between their theology and my philosophy.

It is my deliberate opinion that the one essential requisite of human welfare in all ways is scientific knowledge of human nature.

If a test of civilization be sought, none can be so sure as the condition of that half of society over which the other half has power.

I want to be a free rover on the breezy common of the universe.

The highest condition of the religious sentiment is when. . . the worshiper not only sees God everywhere, but sees nothing which is not full of God.

It is hard to tell which is worse; the wide diffusion of things that are not true, or the suppression of things that are true.

As new discoveries are causing all-penetrating physical lights so to abound as that, as has been said, we shall soon not know where in the world to get any darkness, so our new facilities for every sort of communication work to reduce privacy much within its former limits.