Peacheykeen - The origin of this type of 'success training' is Napoleon Hill (1883-1970) - a man whom I would classify as one of the most ludicrous charlatans the USA ever produced, but who is generally described as 'the first positive thinking/success guru .'
en.wikipedia.org/wiki/Napoleon_Hill
In 1908, Hill (a journalist) interviewed the steel magnate, Andrew Carnegie - a money-obsessed robber-baron who had become so loaded with guilt, that he was trying to give his fortune away in philanthropic projects around the world (mainly the building of free libraries).
Carnegie befriended young Hill (who evidently pretended affinity with him), and paid him to continue a philanthropic project he'd already started - to interview 500 famous and successful people all over the world to discover their formula for success. After Carnegie's death, Hill spent the rest of his life exploiting his association with Carnegie to pretend that he had synthesized a step-by-step program ('the law of success') for ordinary poor people to follow, which could allow them to become rich and successful, and that he was prepared to share this secret knowledge with anyone (for a price). One of Hill's laws (the law of attraction) was that if you wanted to attract success, you should only hang around with, and listen to, successful and positive winners, and keep well away from, or ignore, poor and negative losers.
Napoleon Hill's comic-books books are still standard reading in many 'MLM' cults.