Hello! Do you know of any interesting books or essays on Sufism?
This is far from my area of expertise and I’m afraid my recommendations will mostly revolve around Sufi poetry. But if you’re interested in these, here you go:
Preface and Annotations by Coleman Barks, in Rumi and the Book of Love
Hafez and the Sufic Ghazal, Iraj Bashiri
Preface and Annotations by Peter Avery, in Angels knocking on the Tavern Door
Weaving with needles and pens: Sufism, self-affirmation, and women’s poetry in the Indian sub-continent, Anna Vanzan
Rumi - Past and Present, East and West: The Life, Teachings, and Poetry of Jalâl al-Din Rumi,Franklin D. Lewis (I can only vouch from excerpts for this one)
Sufism, in the Oxford Handbook of World Philosophy, Erik S. Ohlander
Sufi: Expressions of the Mystic Quest, Laleh Bakhtiar
I have also had my eye on:
I hope this helps!