Why does something exist instead of nothing? Leibniz answered this question by arguing that something exists rather than nothing because a necessary being exists which carries within itself its reason for existence and is the sufficient reason for the existence of all contingent being.
Does Leibniz’s argument therefore leave us in a rational impasse, or might there not be some further resources available for untangling the riddle of the existence of the world? It seems to me that there are. It will be remembered that an essential property of a necessary being is eternality. If then it could be made plausible that the universe began to exist and is not therefore eternal, one would to that extent at least have shown the superiority of theism as a rational world view.
Now there is one form of the cosmological argument, much neglected today but of great historical importance, that aims precisely at the demonstration that the universe had a beginning in time. Originating in the efforts of Christian theologians to refute the Greek doctrine of the eternity of matter, this argument was developed into sophisticated formulations by medieval Islamic and Jewish theologians, who in turn passed it back to the Latin West. The argument thus has a broad inter- sectarian appeal, having been defended by Muslims, Jews, and Christians both Catholic and Protestant.
The article I’ve just quoted is a defense of the kalam cosmological argument for the existence of God.