When an action is once done, it is right or wrong for ever; no accidental failure of its good or evil fruits can possibly alter that.

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

When an action is once done, it is right or wrong for ever; no accidental failure of its good or evil fruits can possibly alter that.

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

We feel much happier and more secure when we think we know precisely what to do, no matter what happens, then when we have lost our way and do not know where to turn.

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.

Namely, we have no right to believe a thing true because everybody says so unless there are good grounds for believing that some one person at least has the means of knowing what is true, and is speaking the truth so far as he knows it.