Confidence comes from memory, in the humblest most confident opinion possible. Train your memory and you are golden. It takes a while, but we all living a journey of life, are we not?
I think Steve recommends The Memory Book by Harry Loraynes. Although it's a wonderful practical book, if you're looking for something a little more afterward I would suggest the book "The Memory Palace of Matteo Ricci," which starts out with a story about the origin of memory systems and how to train them.
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