77. The demons that wage war on us through our shortcomings in virtue are those that teach unchastity, drunkenness, avarice and envy. Those that wage war on us through our excessive zeal for virtue teach conceit, self-esteem and pride; they secretly pervert what is commendable into what is reprehensible.
When we see the former at work in another and condemn them for it we have fallen prey to the latter. That’s not the only way that virtue can be twisted into vice, but it seems to me one of the clearest signs.