Who has authority?

Suppose he had passed his judgement upon a hypothetical proposition, and declared, ‘I judge the proposition, “if it be day, there is light,” to be false,’ what would have happened to the proposition? Who is being judged here? Who has been condemned? The proposition, or he who is utterly mistaken about it? So who on Earth is this man who has authority to pass such judgement on you?

~ Epictetus