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The renowned Persian thinker and poet 'Abd al-Rahman al-Jami (1414-92 CE) wrote his Flashes of Light (Lawa'ih) to explain "the intuitions and verities displayed on the pages of the hearts and minds of men of insight and divine knowledge." Each section of his work consists of a discussion in prose and a portion in verses. Jami provides one of the best, synthetic introductions to Sufi spirituality.
The book is available in two editions:
(1) PDF edition.
PDF sample (20 pages)