The only reason why vigilance over yourself would fail is that passion does not always approach in its obvious form, but often appears to be so comely that you think it is something good, not guessing it is a passion. When anger erupts, for example, it is evident to everyone that this is a passion. However, anger is not always in its obvious form; it often appears as righteous indignation. Every passion has a similar habit of dressing itself up and posing as something comely. You are virtuous and may fall for this bait quite easily. Watch out! One must renounce all that is passionate in its most insignificant forms and subtlest features. Observe, accordingly, and do not allow anything inside.
