Circa 1025 A.D. Ibn Sina (Avicenna) said, "The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes."

It is high time for thee to understand the true nature both of the world, whereof thou art a part; and of that Lord and Governor of the world, from whom, as a channel from the spring, thou thyself didst flow: and that there is but a certain limit of time appointed unto thee, which if thou shalt not make use of to calm and allay the many distempers

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