Zen and the Art of Motorcycle Maintenance - Robert M. Pirsig
Grades cover up failure to teach. A bad instructor can go through an entire quarter leaving nothing memorable in the minds of his class, curve out the scores on an irrelevant test, and leave the impression that some have learned and some have not. But if the grades are removed the class is forced to wonder each day what it's really learning. The questions, "What's being taught? How do the lectures and assignments accomplish the goal?", become ominous. The removal of grades exposes a vacuum.
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