St. Thomas Aquinas is known for producing history's 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.

Cambridge Center