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You will be civilized on the day you can spend a long period doing nothing, learning nothing, and improving nothing, without feeling the slightest amount of guilt.

Nassim Nicholas Taleb (2016). “Incerto 4-Book Bundle: Fooled by Randomness The Black Swan The Bed of Procrustes Antifragile”, p.1728, Random House
You will be civilized on the day you can spend a long period doing nothing, learning nothing, and improving nothing, without feeling the slightest amount of guilt.