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Debates regarding reason
Some philosophers believe that the separation of rationality from irrationality is an illusion.
The following two dialogs between philosophers may serve as examples.
Philosopher A: Suppose a scientist is trying to solve a problem and follows a line of thought that is non-conformist. Is he being rational or irrational?
Philosopher B: Irrational.
Philosopher A: Not necessarily. Science can not advance without non-conformist thought. What if it turns out he's right and everyone else is wrong? History will then judge that he was rational. Copernicus' line of thought regarding heliocentrism is an example. Everyone around him at the time thought he was irrational regarding it. At that point in history, civilization's concept of rationality versus irrationality with regards to world view completely inverted. Entire bodies of knowledge were wrong -- not just one fact. In the future much of what we know is rational today, will be discovered to actually be irrational. Consensus can not be used as a reference for rationality.
Philosopher A: If I am imagining things, am I being rational?
Philosopher B: Nope.
Philosopher A: In order to consider theories he is famous for, Einstein imagined thought experiments of observers on moving trains, stationary observers, and of himself riding a beam of light. At that point in history, civilization's concept of rationality versus irrationality with regards to space and time were found to be incorrect. Entire bodies of knowledge were wrong -- not just one fact. In the future much of what we know is rational today, will be discovered to actually be irrational. Consensus can not be used as a reference for rationality.