I regret grinding on classes so much too. In grad school, I was allowed to make one B. Any more and I couldn't graduate. Once I had one class left and made all

I regret grinding on classes so much too. In grad school, I was allowed to make one B. Any more and I couldn't graduate. Once I had one class left and made all As, I decided I'd be lazy and get a B. I worked 50% less and still made an A. It made me realize how much extra I had been working for marginal improvements.