malevolence

That is to say, if Reason is proved to control the passions adverse to temperance, gluttony and lust, it is also clearly shown to be lord over the passions, like malevolence, opposed to justice, and over those opposed to manliness, namely rage and pain and fear.

None of you can extirpate a malevolent disposition, but Reason can be his powerful ally against being swayed by malevolence.