In the Summa Theologiae, Thomas Aquinas includes five arguments answering the question of whether we can know if God exists. In his five ways, Aquinas uses human reason to conclude what faith has already revealed to us.

Aquinas drew on the philosophy of Aristotle in his theology, using both faith and reason to give us some of the most erudite as well as understandable explanations of revealed truths.

Pope Leo XIII said in his encyclical Aeterni Patris that "reason, borne on the wings of Thomas to its human height, can scarcely rise higher, while faith could scarcely expect more or stronger aids from reason than those which she has already obtained through Thomas."

In a time when some groups claimed that the truths of faith and the truths of science were separate and incongruent, Aquinas demonstrated that the sciences reveal the one Truth in harmony with revelation.

Aquinas' five arguments for God's existence are one of his most widely known contributions. Thanks to the work of this saint, we are all given the ability to raise our reason higher in contemplation of our Creator.

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