A normal human being, can't think optimally.
In fact, before 25 yrs, there's probably no hope that a person will even start to think properly.
Reasons:
1. Before 25, capacity for abstraction is limited
2. The structure of the mind is attached to objects and psychological intentions that inhibit optimal thinking
3. There's no system of training available for overcoming the inhibitions of the mind for most of us. Apparently, one can be taught many things in school, but thinking isn't part of the learning.
After 25, most have no time for learning or even noting that their thinking is faulty.
So, I don't want to be 'normal' anymore.
Try keeping off being normal, friends!