Well, if one's thoughts can be altered depending on the amount of oxygen the brain receives. How can you possibly be sure about your own rationality. Couldn't you rationally start to question anything you've come to a conclusion about before, as just a byproduct of your brain's oxygen levels at that time.
The best part about true things is they are still true whether you believe and understand them or not. Seeking truth isn't limited by your ability to understand everything.
I'm not sure about that. If there's no conscious mind to interpret something, can anything possibly be True? Or is it just information.
I believe by "true things" what is meant is "as good as a real world experience as one can get", rather than "logically sound".
It is certainly reasonable to argue about whether logic stands on its own without an observer, but not to doubt that there is a true world out there to be experienced.
Oddly enough becoming a serious athlete, changing my diet and training as my job, completely changed who I am and remembering my thought processes and overall mental state of the previous lifestyle is bizarre as though that person is truly alien to my current self.
So increasing your VO2 max, has improved how your brain functions. A few years ago, I read an article where they improved kids Math scores by having them exercise on a treadmill before class.