The oldest surviving Persian treatise on Sufism, written in the eleventh century. Nicholson's 1911 translation, complete with notes.
The complete text in 29 sections, 425 pages in the print edition. Public domain and free to read.
This text is in the public domain and free to read here. If you would like it typeset, annotated and bound, the Hidden Lantern edition is available in print.
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