“The similarity between Christ and Socrates consists essentially in their dissimilarity. Just as philosophy begins with doubt, so also a life that may be called human begins with irony.”
1840s, On the Concept of Irony with Continual Reference to Socrates (1841)
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Sören Kierkegaard 309
Danish philosopher and theologian, founder of Existentialism 1813–1855Related quotes
Source: Nietzsche: Life as Literature (1985), p. 26.

Journals and Papers III 3284 (1841)
1840s, The Journals of Søren Kierkegaard, 1840s

“May you live in such a way that your death is just the beginning of your life.”
Source: Outlive Your Life: You Were Made to Make A Difference
if he does depart from his state of wonder, he has ceased to philosophize.
Source: Leisure, the Basis of Culture (1948), The Philosophical Act, pp. 105–106

Source: god is Not Great: How Religion Poisons Everything

Variant: The key to wisdom is this - constant and frequent questioning, for by doubting we are led to question and by questioning we arrive at the truth.

Kurt Lewin (1939) "When facing danger". In Lewin, G. W. (Ed.), Resolving Social Conflict. London: Harper & Row.
1930s