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What sustains us, in belief as in action, is not reason or justification, but something more basic than these-for we go on in the same way even after we are convinced that the reasons have given out. [FN:Β As Hume says in a famous passage of the Treatise: "Most fortunately it happens, that since reason is incapable of dispelling these clouds, nature herself suffices to that purpose, and cures me of this philosophical melancholy and delirium, either by relaxing this bent of mind, or by some avocation, and lively impression of my senses, which obliterate all these chimeras. I dine, I play a game of backgammon, I converse, and am merry with my friends; and when after three or four hours' amusement, I would return to these speculations, they appear so cold, and strain'd, and ridiculous, that I cannot find in my heart to enter into them any farther" (Book 1, Part 4, Section 7; Selby-Bigge, p. 269).] If we tried to rely entirely on reason, and pressed it hard, our lives and beliefs would collapse-a form of madness that may actually occur if the inertial force of taking the world and life for granted is somehow lost. If we lose our grip on that, reason will not give it back to us.
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