Whatever we know without inference is mental.

When the journey from means to end is not too long, the means themselves are enjoyed if the end is ardently desired.

There is much pleasure to be gained from useless knowledge.

The wise man thinks about his troubles only when there is some purpose in doing so; at other times he thinks about other things, or, if it is night, about nothing at all.

In a logically perfect language, there will be one word and no more for every simple object, and everything that is not simple will be expressed by a combination of words, by a combination derived, of course, from the words for the simple things that enter in, one word for each simple component.

The most savage controversies are about matters as to which there is no good evidence either way.

The root of the matter is a very simple and old fashioned thing... love or compassion. If you feel this, you have a motive for existence, a guide for action, a reason for courage, an imperative necessity for intellectual honesty.