Zosimus
Active Member
If someone is certain of something, then he should hold to it regardless any evidence presented to the contrary. Since he is certain, he should know that any counter evidence is either false or misleading.But, reason would dictate that certainty requires evidence of some kind.
Yet, if someone holds to a theory regardless any evidence presented against the theory, then he is irrational.
Thus, it is irrational to be certain of anything.