Thou dost make supplication unto Him, And He doth hear thee, And thy vows thou completest.

You will make your prayer to him, and be answered; and you will give effect to your oaths.

You will plead with him, and he will listen to you, and you will pay your vows.

Thou shalt make thy prayer unto him - God would then hear him, for he would be righteous. This was one of the blessings which would follow reconciliation. It is, in fact, one of the blessings of a return to God. He hears the cry of his people, and answers their supplications. To be permitted to go to God and to tell him all our needs, to plead for all we need and to implore blessings on our families and friends, is a privilege of far higher value than anything which wealth can bestow; is worth more than all the honors of this world.
And thou shalt pay thy vows - That is, thy vows shall be accepted; thou shalt obtain those blessings for which thou didst make thy vows.

Thou shalt make thy prayer unto him - תעתיר tatir, thou shalt open or unbosom thyself. And when the heart prays, God hears; and the person, being blessed, vows fidelity, prays on, is supported, and enabled to pay his vows.

Thou shalt make thy prayer unto him,.... To God, and him only; for not a creature, angels, or men, are to be prayed to; and this is to be done in a supplicating, entreating way, as the word signifies; not pleading merit, but mercy, not presenting prayers and supplications for a man's own righteousness' sake, but for the Lord's mercy's sake, and for the sake of Christ and his righteousness; and prayer is to be made in this manner frequently, to be multiplied, as the word also signifies; prayer should be made always, and without ceasing; and this is not only a duty, but a privilege; and as such it is here observed, even as a benefit and blessing to be enjoyed; as it is when a man can come to God as his Father, through Christ the Mediator, with boldness and confidence, in the faith of him, and to God as on a throne of grace, where he may find grace and mercy to help him in time of need, and especially it is so when attended with the success following:
and he shall hear thee; as he does hear those that pray to him in the name of Christ, in the exercise of faith, and in the sincerity and uprightness of their hearts; and answers their requests, fulfils their desires, and gives them what they ask of him; for he is a God hearing prayer, and sooner or later, in his own time and way, grants the petitions of his people:
and thou shalt pay thy vows; the sacrifices of praise and thanksgiving which he promised to offer up to God, should he grant him the desires of his heart; and these being granted, he would be laid under obligation to perform his promises; so that this also is to be considered as a benefit and blessing; for it does not so much regard the payment of vows, as it is designed to observe to him that he should have that done for him which would be a sufficient ground and reason for paying his vows, or making good what he promised in the time of his distress; since what he then requested, and was the condition of his vow, should now be granted; see Psalm 56:12.

(Isaiah 58:9, Isaiah 58:14).
pay thy vows--which thou hast promised to God in the event of thy prayers being heard: God will give thee occasion to pay the former, by hearing the latter.

Make - The word is, thou shalt multiply thy prayer. Under all thy burdens, in all thy wants, cares and fears, thou shalt send to heaven for wisdom, strength and comfort. Pay - Thou shalt obtain those blessings for which thou didst make vows to God, and therefore, according to thy obligation, shalt pay thy vows to him.