On the other hand, no matter what you do, you can’t invest like Warren Buffett.

https://www.forbes.com/sites/adamhartung/2014/11/19/why-you-...

The whole idea of succeeding by “grit” makes way too many people too idealistic and unrealistic.

Don’t get me wrong, Peter Drucker (hopefully that’s the Peter you are referring to) had some great actionable advice. But believing in yourself and having grit is about as banal as “thoughts and prayers”