“The significance of that 'absolute commandment', know thyself — whether we look at it in itself or under the historical circumstances of its first utterance — is not to promote mere self-knowledge in respect of the particular capacities, character, propensities, and foibles of the single self. The knowledge it commands means that of man's genuine reality — of what is essentially and ultimately true and real — of spirit as the true and essential being.”
Encyclopedia of the Philosophical Sciences (1816)
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Georg Wilhelm Friedrich Hegel 106
German philosopher 1770–1831Related quotes

I.
Outline of the Doctrine of Knowledge (1810)
Context: The Doctrine of Knowledge, apart from all special and definite knowing, proceeds immediately upon Knowledge itself, in the essential unity in which it recognises Knowledge as existing; and it raises this question in the first place — How this Knowledge can come into being, and what it is in its inward and essential Nature?
The following must be apparent: — There is but One who is absolutely by and through himself, — namely, God; and God is not the mere dead conception to which we have thus given utterance, but he is in himself pure Life. He can neither change nor determine himself in aught within himself, nor become any other Being; for his Being contains within it all his Being and all possible Being, and neither within him nor out of him can any new Being arise.

Source: The Limits of Evolution, and Other Essays, Illustrating the Metaphysical Theory of Personal Ideaalism (1905), The Harmony of Determinism and Freedom, p.353-4

Es giebt keine Selbstkenntniss als die historische. Niemand weiss was er ist, wer nicht weiss was seine Genossen sind.
“Ideas,” Lucinde and the Fragments, P. Firchow, trans. (1991), § 139

“All types of knowledge, ultimately mean self knowledge.”
Bruce Lee: The Lost Interview (1971)
Source: Tao of Jeet Kune Do
“Self-knowledge is the only basis of true knowledge.”
“Socrates’ words, “Know thyself” remain for all those who seek true knowledge and being.”
All and Everything: Views from the Real World (1973)
Context: There do exist enquiring minds, which long for the truth of the heart, seek it, strive to solve the problems set by life, try to penetrate to the essence of things and phenomena and to penetrate into themselves. If a man reasons and thinks soundly, no matter which path he follows in solving these problems, he must inevitably arrive back at himself, and begin with the solution of the problem of what he is himself and what his place is in the world around him. For without this knowledge, he will have no focal point in his search. Socrates’ words, “Know thyself” remain for all those who seek true knowledge and being.

“True wisdom consists in two things: Knowledge of God and Knowledge of Self.”
Book 1 Chapter 1, p. 44
Institutes of the Christian Religion (1536; 1559)
Context: Without knowledge of self there is no knowledge of God.
Our wisdom, in so far as it ought to be deemed true and solid Wisdom, consists almost entirely of two parts: the knowledge of God and of ourselves. But as these are connected together by many ties, it is not easy to determine which of the two precedes and gives birth to the other.