In the world of academia, philosophers, it seems to me, talk a great deal, and listening to their discussions can increase the potential to develop one’s mental capacity—or reduce it to mush.
I saw a discussion online about beauty. The professors in the conversation put forth long strings of sentences that were hard to follow. They made a lot of sense, but they were quite difficult to comprehend, even when I listened carefully.
When I was in grad school, theology forced my brain to think hard as well, but in a different way. I had to stretch beyond my perceived aptitude. Sort of like the idea of infinity in geometry — “Look there, beyond what you can see!”