The scientific discovery appears first as the hypothesis of an analogy; and science tends to become independent of the hypothesis.

If I steal money from any person, there may be no harm done from the mere transfer of possession; he may not feel the loss, or it may prevent him from using the money badly. But I cannot help doing this great wrong towards Man, that I make myself dishonest.

He who truly believes that which prompts him to an action has looked upon the action to lust after it, he has committed it already in his heart.

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.

The scientific discovery appears first as the hypothesis of an analogy; and science tends to become independent of the hypothesis.

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.

A little reflection will show us that every belief, even the simplest and most fundamental, goes beyond experience when regarded as a guide to our actions.