What determines whether the procedures for proving the affirmative statement of God's existence may be called a proof? Certainly, it is necessary that all premises be true and that a reliable inference schemata be applied. One premise appears to be the most critical in the theistic argument. This premise is the principle of sufficient reason. I hold the view that the principle of sufficient reason cannot be found among the premises of any metaphysical explanation of reality, so I suggest that the terms “proof” and “argument” not be used. Instead, we could speak of ways of acquiring discursive knowledge of God and ways of indirect substantiation of God's existence.