The greatest school is the University of Hard Knocks. Its books are bumps. Every bump is a lesson. If we learn the lesson with one bump, we do not get that bump again. We do not need it. We have traveled past it. They do not waste the bumps. We get promoted to the next bump.
As we get bumped and battered on life's pathway, we discover we get two kinds of bumps - bumps that we need and bumps that we do not need. Bumps that we bump into and bumps that bump into us. We discover, in other words, that The University of Hard Knocks has two colleges - The College of Needless Knocks and The College of Needful Knocks. And we attend both colleges.