One way I keep my education on market history fresh is by finding and watching decades-old videos of interviews with investing legends. In this one, Louis Rukeyser interviews Peter Lynch and Sir John Templeton. 4:40 into the interview, Templeton says one of the most quotable truths about the difference between investment advisors vs doctors and engineers:
If you go to ten doctors and they tell you the same medicine, that’s the thing to take. If you go to ten engineers on the way to build a bridge and they tell you the same thing, that’s the way. If you go to ten investment advisors and they tell you the same asset, you better stay away from it!