Magick or Mania?

Have just started 'The Drug & Other Stories' by Aleister Crowley, the first thing I have read by a man I have heard so many references to. Will it be the ravings of a madman, or the brilliant work of a genius? I will soon find out.

The sound of his voice on Fields of the Nephilim's sublime 'At the Gates of Silent Memory' is utterly mesmerising and is what, more than anything, inspired me to check out his writing.