“It is the duty of the human understanding to understand that there are things which it cannot understand, and what those things are.”
1847
1840s, The Journals of Søren Kierkegaard, 1840s
Context: It is the duty of the human understanding to understand that there are things which it cannot understand, and what those things are. Human understanding has vulgarly occupied itself with nothing but understanding, but if it would only take the trouble to understand itself at the same time it would simply have to posit the paradox.
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Sören Kierkegaard 309
Danish philosopher and theologian, founder of Existentialism 1813–1855Related quotes
Oscar Iden Lecture Series, Lecture 3: "The State of Individuals" (1976)
“The Forever Trees”, p. 327 (quoting a Zen saying)
The Ivory and the Horn (1996)

"The Illusion of Rewards", p. 43
Awareness (1992)
Context: Do you know what eternal life is? You think it's everlasting life. But your own theologians will tell you that that is crazy, because everlasting is still within time. It is time perduring forever. Eternal means timeless — no time. The human mind cannot understand that. The human mind can understand time and can deny time. What is timeless is beyond our comprehension. Yet the mystics tell us that eternity is right now. How's that for good news? It is right now. People are so distressed when I tell them to forget their past. They're crazy! Just drop it! When you hear "Repent for your past," realize it's a great religious distraction from waking up. Wake up! That's what repent means. Not "weep for your sins.": Wake up! understand, stop all the crying. Understand! Wake up!

Manuscript (1903), published in Q.E.D. Book 1, from Q.E.D., and Other Early Writings (1971)

This Business of Living (1935-1950)

“Let thy understanding enter into the things that are doing and the things which do them.”
VII, 30
Meditations (c. 121–180 AD), Book VII
Context: Direct thy attention to what is said. Let thy understanding enter into the things that are doing and the things which do them.

The essence of everything., Dortmund Germany October 1, 1978, published by the DLM in The Golden Age No 51, February 1979
1970s