My main gripe is that most advice from these books are incomplete, broken, shallow representations of the wisdom that's already been passed down throughout human history. The incomplete nature of these bits of advice, in my experience, end up leading people down a negative path, because the scope of the "wisdom" is so narrow.
I would posit that the wisest among us didn't get that way by reading motivational books nor cognative-behavioral books. They got that way by studying history and philosophy. Not the vestiges of wisdom present in contemporary literature.
I'm not taking the position you shouldn't study philosophy, classical works or religious texts obviously. But you might be surprised what the wisest among us read. (I am not including myself in that category, though I do read motivational books. Other side of the Venn Diagram.)
Not to mention the whole motivational genre has its own canon of classics. Think Dale Carnegie, Og Mandino, Zig Ziglar. I think you would be hard pressed to find a wise man who hasn't benefitted from one such, though I don't know a lot of them personally.
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