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Knowledge handed to you gently, or beaten in by consequences — your pick.
means A unit of teaching, or an experience that forces you to learn something the hard way.
from From Latin lectio, a reading aloud — back when a lesson literally meant someone reading the sacred text at you.
Reading rootsShares ancestry with lecture and legend.
Two flavorsOne you sit through, one you survive.
Plural ironyHard ones rarely need teaching twice.