God Is Perfect.
He is the Rock, His work is perfect; For all His ways are justice, A God of truth and without injustice; Righteous and upright is He. Deuteronomy 32:4 NKJV
He is the rock. So he is called six times in this chapter, and the LXX. all along translates it Theos, God. The learned Mr. Hugh Broughton reckons that God is called the rock eighteen times (besides in this chapter) in the Old Testament (though in some places we translate it strength), and charges it therefore upon the papists that they make St. Peter a god when they make him the rock on which the church is built. God is the rock, for he is in himself immutable immovable, and he is to all that seek him and fly to him an impenetrable shelter, and to all that trust in him an everlasting foundation.
His work is perfect. His work of creation was so, all very good his works of providence are so, or will be so in due time, and when the mystery of God shall be finished the perfection of his works will appear to all the world. Nothing that God does can be mended, Ecclesiastes 3:14. God was now perfecting what he had promised and begun for his people Israel, and from the perfection of this work they must take occasion to give him the glory of the perfection of all his works. The best of men's works are imperfect, they have their flaws and defects, and are left unfinished but, as for God, his work is perfect if he begin, he will make an end.
All his ways are judgment. The ends of his ways are all righteous, and he is wise in the choice of the means in order to those ends. Judgment signifies both prudence and justice. The ways of the Lord are right, Hosea 14:9.
He is a God of truth, whose word we may take and rely upon, for he cannot lie who is faithful to all his promises, nor shall his threatenings fall to the ground.
He is without iniquity, one who never cheated any that trusted in him, never wronged any that appealed to his justice, nor ever was hard upon any that cast themselves upon his mercy.
Just and right is he. As he will not wrong any by punishing them more than they deserve, so he will not fail to recompense all those that serve him or suffer for him. He is indeed just and right for he will effectually take care that none shall lose by him. Now what a bright and amiable idea does this Deuteronomy 34:4 give us of the God whom we worship and what reason have we then to love him and fear him, to live a life of delight in him, dependence on him, and devotedness to him! This is our rock, and there is no unrighteousness in him nor can there be, Psalm 92:15. - Matthew Henry