That they might set their hope in God - That they might place confidence in God; that they might maintain their allegiance to him. The object was to give such exhibitions of his character and government as to inspire just confidence in him, or to lead people to trust in him; and not to trust in idols and false gods. All the laws which God has ordained are such as are suited to inspire confidence in him as a just and righteous ruler; and all his dealings with mankind, when they are properly - that is, "really" - understood, will be found to be adapted to the same end.

And not forget the works of God - His doings. The word here does not refer to his "works" considered as the works of creation, or the material universe, but to his acts - to what he has done in administering his government over mankind.

But keep his commandments - That by contemplating his doings, by understanding the design of his administration, they might be led to keep his commandments. The purpose was that they might see such wisdom, justice, equity, and goodness in his administration, that they would be led to keep laws so suited to promote the welfare of mankind. If people saw all the reasons of the divine dealings, or fully understood them, nothing more would be necessary to secure universal confidence in God and in his government.

That they might set their hope in God,.... And not in the creature, nor in any creature enjoyment; see Job 31:24, the Lord is the only proper object of hope and confidence; Christ, who is truly God, is the hope of his people, and in him they place it, as they have great reason to do; since with him there is mercy, the mercy of God is proclaimed in him; and with him there is redemption, which includes the blessings of peace, pardon, and righteousness; and a plenteous one, a redemption from all sin; and it is the Gospel which points out these things in Christ, and encourages a firm and settled hope and trust in him: and this shows that that is meant by the law and testimony; since the law of Moses gives no encouragement to hope in God; it convinces of sin, but does not direct to a Saviour, and so leaves without hope; it works wrath, terror, and despair; it is in the Gospel only Christ is set before men, as the object of hope to lay hold on, and which is as an anchor sure and steadfast, where they may securely place it:

and not forget the works of God; which the Gospel declares; not only the miracles of Christ recorded by the evangelists, but the works of grace, redemption, and salvation; the remembrance of which is kept up by the ministry of the word, and the administration of ordinances:

but keep his commandments; the commandments of Christ, and which are peculiar to the Gospel dispensation; and are to be kept in faith, from a principle of love, through the grace and strength of Christ, and to the glory of God by him; see John 14:15.

That they might {f} set their hope in God, and not forget the works of God, but keep his commandments:

(f) He shows where the use of this doctrine exists: in faith, in the meditation of God's benefits, and in obedience.

78:1-8 These are called dark and deep sayings, because they are carefully to be looked into. The law of God was given with a particular charge to teach it diligently to their children, that the church may abide for ever. Also, that the providences of God, both in mercy and in judgment, might encourage them to conform to the will of God. The works of God much strengthen our resolution to keep his commandments. Hypocrisy is the high road to apostacy; those that do not set their hearts right, will not be stedfast with God. Many parents, by negligence and wickedness, become murderers of their children. But young persons, though they are bound to submit in all things lawful, must not obey sinful orders, or copy sinful examples.