I don't like to read manuals. Manuals are boring and I will probably figure this out without one.
No matter how intelligent you are, nobody wants to pick up the boring textbook about Microsoft Excel and go through it step-by-step. Most of us would even choose an exhausting workout over that kind of torture.
But those who do find the willpower to understand the Excel manual have an advantage for life. They took the time to learn how to solve problems, while the rest of us try to work around them.
Giving them exponentially more time and skills to accomplish their goals.