A -> B -> A -> B -> A

You: "What does it mean to focus all of your willpower on something?"

Him: "In means to want only that, and nothing else, but only mentally-wise"

What to answer?

a. But what if our brain is limited by the simply fact that it's a limited material inside the universe we live in?

b. What if the abilty to understand more complicated stuff does not *discover* truth, but only strengthes the abilty to see more possible aspects, like philosophical thinking?