Impressions and elaborations on Crowley's essay
You can read the full essay by Crowley on PDF here: https://archive.org/details/CollectedPdfsByAleisterCrowley/AleisterCrowley-Duty/
You can read the full essay by Crowley on PDF here: https://archive.org/details/CollectedPdfsByAleisterCrowley/AleisterCrowley-Duty/