"Every man has inside himself a parasitic being who is acting not at all to his advantage"

This quote by William S. Burroughs suggests that everyone has a part of themselves that is not helpful to them. This parasitic being is an allegory for the adverse aspects of our characters that can lead us to choose that are not in our best interest. Maybe taken an advising to be familiar with our very own internal satanic forces as well as to be conscious of the selections we make. It is a tip that we ought to aim to be our ideal selves and also to choose that will benefit us over time. Burroughs is suggesting that we must know our own inner struggles and also make every effort to make decisions that will certainly lead us to success.