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There must be room for the imagination to exercise its powers; we must conceive and apprehend a thousand things which we do not actually witness.

Our understanding, great as it sometimes seems, can be nothing but the wide-eyed wonder of the child when measured against omniscience.

Observation and thinking are the two points of departure for all the spiritual striving of man, insofar as he is conscious of such striving. The workings of common sense, as well as the most complicated scientific researches, rest on these two fundamental pillars of our spirit.

There comes a time when the mind takes a higher plane of knowledge but can never prove how it got there.

You have to have some kind of power of observation, almost like a trained observer.

For purposes of action nothing is more useful than narrowness of thought combined with energy of will.

The power of accurate observation is commonly called cynicism by those who have not got it.

You can't observe as much if you're observed by others.