Several weeks ago, I finished a lengthy trilogy of posts on an ancient argument for the existence of God known as the Prime Mover Argument (the first can be found here, the second here, and the third here). In that series, I mentioned in passing that the argument, though originating with Aristotle, was also built upon by the great St. Thomas Aquinas. Aquinas actually used five main arguments to establish the existence of God, which are called the “Five Ways.” The Prime Mover Argument, which I explained and defended in that trilogy, is the First Way. This article is the beginning of a new series, looking at the Second Way, which is known as the First Cause Argument.
Before looking at the argument itself, there are a number of preliminary issues that it is important to understand or at least note. The first is that there are many different “first cause” arguments, and Aquinas’s Second Way is just one example of such. First cause arguments, also known as cosmological arguments (not because they necessarily have anything to do with the scientific field of cosmology, but rather because they start from facts about the world or kosmos in Greek) generally seek to establish the existence of Continue reading