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" "The dominant concept in Aristotle's philosophy of nature is his notion of causation. ...The final cause states that each substance has an inherent purpose. Thus there must be a purpose or design in the acorn such that it always grows into an oak tree. This aspect of existence is indicated by the word entelechy; this means the purpose that guides things to develop in one way rather than another.
John Freely (26 June 1926 – 20 April 2017) was an American physicist, teacher, and author of popular travel and history books on Istanbul, Athens, Venice, Turkey, Greece, and the Ottoman Empire.
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