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The most difficult thing is to know what we do know, and what we do not know.

— P. D. Ouspensky Tertium Organum (1912)

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More quotes by P. D. Ouspensky

Generally speaking, the significance of the indirect results may very often be of more importance than the significance of direct ones.

Tertium Organum (1922)

Knowledge must start from some foundation, something must be recognized as known; otherwise we shall be obliged always to define one unknown by means of another.

Tertium Organum (1912)

In all living nature (and perhaps also in that which we consider as dead) love is the motive force which drives the creative activity in the most diverse directions.

Tertium Organum (1922)

People who think they can control their negative emotions and manifest them when they want to, simply deceive themselves.

The Psychology of Man's Possible Evolution (1950)

Existing criminology is insufficient to isolate barbarism.

A New Model of the Universe (1932)

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