Charles H. Spurgeon on 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.