[liendolucas]

> have a sort of "ceiling" in regards to their capabilities, intellectual or otherwise.

I refuse to believe that. It depends how much motivation, discipline and perseverance you have. The human mind is capable of anything! If there's something that you think it falls your capacity is because you haven't put considerable effort on the task that you're trying to achieve. And if you think you have set a truly high bar, then try achieving less intimidating tasks, even if you aren't successful for the original task you've set for the learning journey can even be more rewarding.