When you’re dating, the instant you know this relationship is not going to be the one that leads to marriage, you should probably move on. When you’re studying something, like a geography or history class, and you realize you are never going to use the information, drop the class. It’s a waste of time. It’s a waste of your brain energy. I’m not saying don’t do the 99 percent, because it’s very hard to identify what the 1 percent is. What I’m saying is: when you find the 1 percent of your discipline which will not be wasted, which you’ll be able to invest in for the rest of your life and has
  
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