Know you not that a good man does nothing for appearance sake, but for the sake of having done right? - Epictetus

So in the field of assent you cannot be hindered or obstructed.

Whenever anyone criticizes or wrongs you, remember that they are only doing or saying what they think is right. They cannot be guided by your views, only their own; so if their views are wrong, they are the ones who suffer insofar as they are misguided.

People find particular things, however, frightening; and it's when someone is able to threaten or entice us with those that the man himself becomes frightening.