Some of our weaknesses are born in us, others are the result of education; it is a question which of the two gives us most trouble.

Solitude is fine when you are at peace with yourself and have something definite to do.

The world is for thousands a freak show; the images flicker past and vanish; the impressions remain flat and unconnected in the soul. Thus they are easily led by the opinions of others, are content to let their impressions be shuffled and rearranged and evaluated differently.

Nature knows no pause in progress and development, and attaches her curse on all inaction.

When an idea is wanting, a word can always be found to take its place.

Everything factual is, in a sense, theory. The blue of the sky exhibits the basic laws of chromatics. There is no sense in looking for something behind phenomena: they are theory.

Whatever you cannot understand, you cannot possess.