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In page Substance theory:

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According to Thomas Aquinas, beings may possess substance in three different modes. Together with other Medieval philosophers, he interpreted God's epithet "El Shaddai" (Genesis 17:1) as self-sufficient and concluded that God's essence was identical with existence.[3] Aquinas also deemed the substance of spiritual creatures identical with their essence (or form); therefore he considered each angel to belong to its own distinct species.[citation needed] In Aquinas' view, composite substances consist of form and matter. Human substantial form, i.e. soul, receives its individuality from body.[4]