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St. Thomas Aquinas is known for producing historys most complete system of Christian philosophy. In the late 13th century, this quiet, reflective Dominican scholar combined the work of Aristotle with Christian, Jewish, Muslim, and pagan thought to reconcile reason and faith. For Thomas, intellectual knowledge is a sign of the spirituality that energizes the human center. He believed we can know that God exists, but not what god is like. Thomas's masterpiece, the Summa Theologiae, contains over 10,000 objections and replies to fundamental questions about God and the world. It includes Thomas's famous five ways to prove God's existence, which are (1) the unmoved mover, (2) the uncaused cause, (3) the necessary being, (4) the perfect Goodness, and (5) the guiding intelligence. His thought continues to influence Catholic philosophy today.