Dátum narodenia: 21. august 980
Dátum úmrtia: 24. jún 1037
Ďalšie mená:Ibn Síná
Ibn Síná alebo Avicena alebo Avicenna bol stredoveký perzský filozof, predstaviteľ východnej vetvy arabskej filozofie, lekár, prírodovedec, politik a básnik.
„The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes.“
Context: The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes. Therefore in medicine we ought to know the causes of sickness and health. And because health and sickness and their causes are sometimes manifest, and sometimes hidden and not to be comprehended except by the study of symptoms, we must also study the symptoms of health and disease. Now it is established in the sciences that no knowledge is acquired save through the study of its causes and beginnings, if it has had causes and beginnings; nor completed except by knowledge of its accidents and accompanying essentials. Of these causes there are four kinds: material, efficient, formal, and final. "On Medicine, (c. 1020) http://www.fordham.edu/halsall/source/1020Avicenna-Medicine.html
This was declared without citation to have been attributed to Avicenna in A Rationalist Encyclopaedia : A Book of Reference on Religion, Philosophy, Ethics, and Science (1950), by Joseph McCabe, p. 43;<!-- probably because of a misreading of that article by McCabe --> it was also later wrongly attributed to Averroes in The Atheist World (1991) by Madalyn Murray O'Hair, p. 46. It actually originates as a statement by the atheist Al-Maʿarri, earlier translated into English in A Short History of Freethought Ancient and Modern (1906) by John Mackinnon Robertson, Vol. I, Ch. VIII : Freethought under Islam, p. 269, in the form: "The world holds two classes of men ; intelligent men without religion, and religious men without intelligence."
As quoted in Familiar Medical Quotations (1968) by Maurice B. Strauss
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