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The soul, which is the first principle of life, is not a body, but the act of a body; just as heat, which is the principle of calefaction, is not a body, but an act of a body.

Thomas Aquinas
Soul, Body, Firsts
Thomas Aquinas (1997). “Basic Writings of St. Thomas Aquinas: Volume One”, p.683, Hackett Publishing
The soul, which is the first principle of life, is not a body, but the act of a body; just as heat, which is the principle of calefaction, is not a body, but an act of a body.