From Vernon Smith‘s 2008 book Discovery: A Memoir, pp. 15-16:
[A]ny three-year old can force you to the outer-most limits of your knowledge on any topic by asking, “Why?” three times in response to any answer.
Vernon truly knows what intellectual humility is, along with a few others including Montaigne, Voltaire, Bastiat, Hayek, and Buchanan. It’s a shame their club is so small. Economics, especially, would be in a much better place if more of its practitioners realized that their most painstakingly constructed intellectual edifices can be dismantled in minutes by a toddler.
Inertia Wins! 