Psalms 66:3

Say unto God. Turn all your praises to him. Devotion, unless it be resolutely directed to the Lord, is no better than whistling to the wind. How terrible art thou in thy works. The mind is usually first arrested by those attributes which cause fear and trembling; and, even when the heart has come to love God, and rest in him, there is an increase of worship when the soul is awed by an extraordinary display of the more dreadful of the divine characteristics. Looking upon the convulsions which have shaken continents, the hurricanes which have devastated nations, the plagues which have desolated cities, and other great and amazing displays of divine working, men may well say: How terrible art thou in thy works. Till we see God in Christ, the terrible predominates in all our apprehensions of him. Through the greatness of thy power shall thine enemies submit themselves unto thee; but, as the Hebrew clearly intimates, it will be a forced and false submission. Power brings a man to his knee, but love alone wins his heart. Pharaoh said he would let Israel go, but he lied unto God; he submitted in word but not in deed. Tens of thousands, both in earth and hell, are rendering this constrained homage to the Almighty; they only submit because they cannot do otherwise; it is not their loyalty, but his power, which keeps them subjects of his boundless dominion.

How terrible art thou - Consider the plagues with which he afflicted Egypt before he brought your fathers from their captivity, which obliged all his enemies to submit. Thine enemies submit themselves - Literally, lie unto thee. This was remarkably the case with Pharaoh and the Egyptians. They promised again and again to let the people go, when the hand of the Lord was upon them: and they as frequently falsified their word.

Say unto God - In your songs of praise. Let your songs be directly addressed to him, setting forth the grounds of that praise, or the reasons why it is due to him. How terrible art thou in thy works! - How fearful! how much to be reverenced! The meaning is, that the manifestations of his power and greatness, in the events which occur under his government, are suited to impress the mind with awe and reverence. Through the greatness of thy power - By the putting forth of thy power. Or, Thou hast such power over thine enemies as to be able to compel them to submit to thee. Shall thine enemies submit themselves unto thee - Margin, Lie, or yield reigned obedience. The Hebrew word means to lie, to speak lies; then, to feign, to flatter, to play the hypocrite. It is thus applied to the vanquished, who make a hollow profession of submission and love to their victors. See the word explained in the notes at Psa 18:44; compare Psa 81:15; Deu 33:29; Job 31:28. The meaning here is, that he had power to subdue them, and to compel them to acknowledge his right to reign. It is the putting forth of mere power which is here referred to; and all that such power can do, is to secure outward and reigned submission. It cannot of itself secure the submission of the heart, the will, and the affections. That is to be secured by love, not by power; and the difference between the submission of the true people of God and that of all others is that the former are subdued by love, the latter by power; the submission of the former is genuine, that of the latter is forced. The inhabitants of heaven will be submissive to God because they love him; the dwellers in hell will be restrained by power, because they cannot deliver themselves. […]