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Beware, O my son, of self-incense ... It is the most dangerous, on account of its agreeable intoxication. Profit by thy own wisdom, but learn to respect the wisdom of thy fathers likewise. And remember, O my beloved, that the light of Allah's truth will often penetrate much easier an empty head, than one that is so crammed with learning that many a silver ray is crowded out for want of space ...

Tales of the Impious Khalif, quoted in Blavatsky's Isis Unveiled I, p. 43
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