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Avicenna (980-1037 AD) was a Persian physician and philosopher best known for his contributions to medicine and other subjects. Wikipedia says,
"Avicenna wrote extensively on early Islamic philosophy, especially the subjects logic, ethics and metaphysics, including treatises named Logic and Metaphyiscs... Avicenna's psychology and theory of knowledge influenced William of Auvergne, Bishop of Paris and Albertus Magnus, while his metaphysics influenced the thought of Thomas Aquinas." (Wikipedia: Avicenna, 8.21.21 UTC 19:18)Wikipedia also says,
"Besides philosophy and medicine, Avicenna's corpus includes writings on astronomy, alchemy, geography and geology, psychology, Islamic theology, logic, mathematics, physics and works of poetry." (Wikipedia: Avicenna, 8.21.21 UTC 19:18)The rest of this post is some quotes from Avicenna.
Causation
"The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes." (On Medicine, 1020)
God
"Prayer is that which enables the soul to realize its divinity. Through prayer human beings worship absolute truth, and seek an eternal reward... Prayer is the worship of the first cause of all things, the supreme ruler of all the world, the source of all strength." (AZQuotes.com)
"God, the supreme being, is neither circumscribed by space, not touched by time; he cannot be found in a particular direction and his essence cannot change." (Quoted in Readings From Islam by Robert Van der Weyer)
