From the new edition of Taleb’s Black Swan:

[L]iving organisms (whether the human body or the economy) need variability and randomness. What’s more, they need the Extremistan type of variability, certain extreme stressors. Otherwise they become fragile.

[h/t to Steve McHale]

[To the tune of Derek and the Dominos, “Let it Rain,” from the album Live at the Fillmore East (New York NY), 23 October 1970 (a 3-star song, imo).]