The chief obstacle is that we are quick to be satisfied with ourselves.
If we find someone to call us good men, cautious and principled, we acknowledge him.
We are not content with a moderate eulogy, but accept as our due whatever flattery has shamelessly heaped upon us.
We agree with those who call us best and wisest, although we know they often utter many falsehoods:
we indulge ourselves so greatly that we want to be praised for a virtue which is the opposite of our behavior.
A man hears himself called ‘most merciful’ while he is inflicting torture.
So it follows that we don’t want to change because we believe we are already excellent.