"Say yes to everything before you're 40, and say no to everything after you're 40." "Before you're 40, you don't know what you're good at. You don't know what you're energized by. And the world is changing." "Trying lots of things that you're curious about allows you to figure out, if you pay attention: here's what the parts of it I'm energized by, here are the parts of it that exhaust me. Then just maximize for your energy." "By the time you're 40, you should know those things. What are those things for you? And after that, you say no to everything else, because now the bet you can make is: I can work at these things for a long time and know that I care about them." - Atul Gawande