Some lessons and skills can only be learned the hard way. Making sure the projector bulbs work before that big presentation is one. Withholding your wardrobe opinions with your wife is another. Making sure you bring your phone charger another.
And then there are a few serious lessons that effective leaders must learn the hard way. In fact the hard way is the only way these lessons and the ensuing skills are ever learned.
They must be experienced, not explained. Caught not just taught.