The Priest has much to say regarding the lines in question. The charge might then be read as a charge to self-sacrifice or equilibrium. I only put forward this suggestion to exhibit the profundity of thought required to deal even with so plain a passage. Anything whatsoever that binds the will, hinders it, or diverts it, is sin. That is, sin is the appearance of the dyad.
Sin is impurity.
Ibid, pages 97-8. Crowley here suggests that the veracity of the interpretation does not depend upon its form so much as upon who does the interpreting. It is less that one might interpret incorrectly than that one who is not 'illuminated' or, perhaps, 'mature' might interpret incompletely and thus lock onto a false subset of all possible interpretations. He seems to say that there are no false interpretations of 'Do what thou wilt'. There are, thus, no 'correct' interpretations in isolation.