Here’s a powerful corollary to proper selection. Choose the highest-yield material and you can be an idiot and still enjoy stunning success. This is the power of understanding the difference between being effective (doing the right things) and being efficient (doing things right).
Think about a professional football player stepping up to take a penalty kick in a World Cup Final. He has done this 1000 times before in training. Under normal circumstances he could score the goal with his eyes closed. But under the circumstances the pressure is too great. The weight of the world is on his shoulders. So he capitulates and misses.