Scientific method, although in its more refined forms it may seem complicated, is in essence remarkably simply. It consists in observing such facts as will enable the observer to discover general laws governing facts of the kind in question. The two stages, first of observation, and second of inference to a law, are both essential, and each is susceptible of almost indefinite refinement. (1931)

Thomas Aquinas states parenthetically, as something entirely obvious, that men are more rational than women. For my part, I see no evidence of this.

For a good notation has a subtlety and suggestiveness which at times make it seem almost like a live teacher.

There can't be a practical reason for believing something that is not true.

Many people when they fall in love look for a little haven of refuge from the world, where they can be sure of being admired when they are not admirable, and praised when they are not praiseworthy.

None of our beliefs are quite true; all have at least a penumbra of vagueness and error.

A hallucination is a fact, not an error; what is erroneous is a judgment based upon it.