This lecture discusses key ideas from the Medieval philosopher, theologian, and Dominican friar, Thomas Aquinas, and focuses on his Summa Theologiae, Prima Pars, q. 2.

It focuses upon his discussion in article 2, bearing on whether God's existence can be proven or demonstrated by rational means at all. He considers several challenges to the project of arguing for God's existence. These include the notion that one should should just believe "by faith" and the idea that human beings would not be able to define God. He also makes a useful distinction between different types of demonstrations.

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You can find Thomas Aquinas' Summa Theologiae online here - www.newadvent.org/summa/