For one thing, you do not understand the difference between actually living out your claims and external evidence, do you? If you lived out your claims in a way that everyone around you acknowledged the greatness of your character, by all means, I will take you self-claim to ultimate authority into consideration.
This seems muddled. If you will only accept someone's claims if you see evidence for those claims, then you're not taking him as the ultimate authority on the subject about which he's making claims, but rather the evidence of your own eyes. If the claim
was that he was the ultimate authority, then by the very act of considering the evidence for or against that you implicitly deny that this is the case. And if you are convinced of that claim by the evidence, rather than by the claim itself, then you have painted yourself into a self-contradictory corner; just as if you said "I'll believe that Pete is the ultimate authority, but only because Joe tells me so".