perhaps that was a bit of an overreaction
Imagine that you are a god. You are both "a" god as well as "the" god, there is no difference. Now, because of ego and petty desires you are disconnected from worshipping that god that is you fully and carrying out its Will. It is your duty toward that god, which is yourself, to go above and and beyond yourself to find out its true desire, or True Will. There is no punishment in the classical sense for failing to do so, shirking your duty, other than conflict and inability to achieve your fullest potential.
Or, as Duquette phrased it, Thelema is a form of sun worship, except that I am the sun. Do What Thou Wilt exacts the most rigorous and rigid discipline, as is said in the Book of Law, "thou hast no right but to do your Will, do that and none shall say nay. For pure Will, unassuaged of purpose, delivered from the lust of result, is in every way perfect." In other words, the only right you have is to do your Will. "Shirking" it would cause problems both because of what I outlined above, but it would also mean conflicting with other' Will, which inevitably leads to at least a bit of head butting, if not worse.
Now, it isn't about external codes of conduct, no "keep the Sabbath or else," no Old Testament vengeful God. Your Will is individual. I suppose certain things are implied and Crowley discusses them in "Duty." Like, stealing from someone interferes with their Will of making a living, killing them interferes with their Will of living, etc.
(I wonder, I suppose misquoting the BoL makes me a center of pestilence, huh?)