Aquinas on the necessity of God

The second way is from the nature of an efficient cause. In the world of the senses we find that there is a consequence of efficient causes, but we never find something that causes itself, and it is impossible to do because it would precede itself–which is impossible…Thus it is necessary to posit some first efficient cause which all men call God.

St. Thomas Aquinas, Summa Theologiae, part I, question 2.

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