Have you ever heard the saying "money doesn't grow on trees"? Of course you have. Everybody has. It comes from our parents, our teachers, our friends, and sometimes from people we don't even like very much but somehow still let program our minds. Sayings like that get repeated so many times in childhood that they stop sounding like an opinion and start sounding like a law of nature. They slide right past your conscious mind - the part of you that questions things, that argues, that says "wait, is that actually true?" - and they drop straight into your subconscious mind, the part of you that runs on autopilot. Your conscious mind decides what to have for lunch. Your subconscious mind decides what you believe is possible for your life. And most of us never noticed the moment the deciding happened.
Here's something funny, though. Money, at least in its original physical form, is paper. And paper comes from trees. So the very saying that was drilled into your head to convince you that wealth was scarce and hard to reach was, on a purely technical level, wrong the entire time. Money does grow on trees. It always has. Somebody just told you it didn't, and you believed them, and that belief did more to shape your bank account than any budget ever will.
That's really what this book is about. Not tree pulp. Not the literal manufacturing of currency. It's about the fact that some ideas get planted in us so early and so deep that we stop questioning them, and those unquestioned ideas quietly decide the shape of our lives. "Money doesn't grow on trees" is really just a stand-in for every limiting phrase that ever took root in your mind - must be nice, I'll never have that, rich people are different, that's not for people like us. Once a sentence like that gets comfortable in your subconscious, it stops being a sentence and starts being a filter. It decides what you notice, what you pursue, what you believe you're allowed to have.