An atom must be at least as complex as a grand piano.

If a belief is not realized immediately in open deeds, it is stored up for the guidance of the future.

This sense of power is the highest and best of pleasures when the belief on which it is founded is a true belief, and has been fairly earned by investigation.

There is one thing in the world more wicked than the desire to command, and that is the will to obey.

Every rustic who delivers in the village alehouse his slow, infrequent sentences, may help to kill or keep alive the fatal superstitions which clog his race.

No simplicity of mind, no obscurity of station, can escape the universal duty of questioning all that we believe.

scientific thought does not mean thought about scientific subjects with long names. There are no scientific subjects. The subject of science is the human universe; that is to say, everything that is, or has been, or may be related to man.