How close men, despite all their knowledge, usually live to madness? What is truth but to live for an idea? When all is said and done, everything is based on a postulate; but not until it no longer stands on the outside, not until one lives in it, does it cease to be a postulate.

Journals of Søren Kierkegaard 1A75, 1835 - The Journals of Søren Kierkegaard, 1830s (Dialectic - Dispute)