For several years I was a member of a mastermind group with several other business professionals. Every time we met inevitably the talk would turn to books each other had read or were reading to improve. Think and Grow Rich is the “Granddaddy of All Motivational Literature” and introduced the mastermind idea.
Mastermind in a nutshell – A mastermind is a tight crew of professionals who meet to brutally call out each other’s bullshit, share raw fuck-ups, and push each other toward winning.
If you want to learn more – go get the book.