De omnibus dubitandum est

De omnibus dubitandum est is a book written by Søren Kierkegaard (under the pseudonym Johannes Climacus), which translates to "everything must be doubted". It was published posthumously.[1] The book portrays the existential consequences of assuming Cartesian doubt, the method of modern philosophy, to its last consequences. The themes portrayed by this book are followed in the subsequent books written by Kierkegaard under the name of Climacus: Philosophical Fragments and its Concluding Unscientific Postscript.


  1. Johannes Climacus, or, De omnibus dubitandum est, and A sermon. Translated, with an assessment by T. H. Croxall, Stanford University Press, 1958

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