It's occurred to me when I read in the book of Proverbs that the back of a fool is made for the rod, that foolish people are those who get kicked in the groin by life on account of bad decisions they made that resulted in bad consequences.
So I came out with my own version of this:
Those who quickly learn the lessons from the kicks in the balls that Life dishes out at them as they journey through in the business of living, such wiser folks end up getting fewer of such kicks from life than do those who prove themselves foolish, those who stumble repeatedly in their life journeys, making badly thought decision after badly thought out decision.
Truly the backs of this second class of human beings, these backs are made to receive beatings from Life itself that uses a rod, in the form of bad and painful experiences, to try to knock some sense into these other folks.
