"Learning from the past is one thing(good) but dwelling on the past can be counterproductive.

Along with that theme, you want as many tools and opinions available that are looking forward.

 Nobody knows everything and everybody knows something...........and all of us are wrong sometimes.

Some of the most accomplished people got that way from building on the knowledge of others......and humbly acknowledging when they had it wrong. "

https://www.marketforum.com/forum/topic/56674/