Some Ans. Questions 1908 by -'Abdu'l-Bahá- 1 Para

Briefly, this is the principal argument of the Sufis; and if we wished to mention all their proofs and explain their answers, it would take a very long time. This is their decisive proof and their plain argument-- at least, of the savants of the Sufis and the Theosophists (294:1)

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