It is not lust alone that one should be afraid of in the life of the world. There is also anger. Anger arises when obstacles are placed in the way of desire.
Lust and self-mutilation are closely related impulses. There are also self-mutilators among knowers: they do not want to be creators under any circumstances.
I spent an hour looking at pots and carpets in the museums the other day, until the desire to describe them became like the desire for the lusts of the flesh.