29. And Moses said. In this answer Moses indirectly hints, that he leaves the presence of Pharaoh, in order duly and purely to supplicate God; since by his unbelief he would in a manner pollute the sacrifices. For, as he had already shown, that legitimate worship could not be offered by the people except away from Egypt, so now he seeks to be alone for prayer; and thus, by this change of place, he indicates that the place, in which Pharaoh dwells, is unholy. We have already said, that Moses promises nothing out of mere rash impulse, but that, taught either by the inspiration of the Spirit, or by sure revelation, he pronounces, with the authority of a prophet, what God is about to do. Moreover, it is not without reason that Moses exhorts Pharaoh to learn from the remission of the punishment, that the God of Israel is the Lord of Egypt also; for the word earth seems here to be limited to Egypt; although I do not deny that it may be properly understood of the whole world; but, whichever you may prefer, Moses rightly concludes, that the glory and dominion of God is perfectly manifested, not only when he appears as an avenger in the infliction of punishment, but that He also shows it in an opposite way, when all the elements are subservient to His mercy. Besides, His power is still more clearly shown forth, when He himself heals the wounds which He has inflicted; and, therefore, in Isaiah 41:23, and Isaiah 45:7, in order to prove His divinity, He joins the two together, viz., that it is His prerogative and attribute both to “do good, or to do evil.”