Seriously, doesn't everyone know that. Clarity is confidence, and without confidence you go nowhere fast as you cannot plan ahead, many studies have proven winners keep winning and losers keep losing. Which is why nost traders fail, the markets are forward looking and 99% of people work in neutral, the minority, and in hindsight, the majority.
The only way to gain confidence is through hard work, the exponential curve, or if you blindly follow someone smarter and/or more experienced than you, the logarithmic curve. The article relates to the latter, and most people with more experience won't take on anyone unless they are paid obscene amounts.
But those without confidence won't have the funds, because they don't have the confidence to generate them, as they can't buy the knowledge they revert to the exponential curve which takes a long time, years and decades, normally giving up a long way before the end which restarts the cycle.
So the article is correct but complete rubbish, because the only way to break the cycle is to experience a 4+ sigma event: a) win the lottery; b) be the handful or people who are trained as a Turtle; c) marry in to wealth; d) experience something so awful it compresses decades in to months.