79:6-13 Those who persist in ignorance of God, and neglect of prayer, are the ungodly. How unrighteous soever men were, the Lord was righteous in permitting them to do what they did. Deliverances from trouble are mercies indeed, when grounded upon the pardon of sin; we should therefore be more earnest in prayer for the removal of our sins than for the removal of afflictions. They had no hopes but from God's mercies, his tender mercies. They plead no merit, they pretend to none, but, Help us for the glory of thy name; pardon us for thy name's sake. The Christian forgets not that he is often bound in the chain of his sins. The world to him is a prison; sentence of death is passed upon him, and he knows not how soon it may be executed. How fervently should he at all times pray, O let the sighing of a prisoner come before thee, according to the greatness of thy power preserve thou those that are appointed to die! How glorious will the day be, when, triumphant over sin and sorrow, the church beholds the adversary disarmed for ever! while that church shall, from age to age, sing the praises of her great Shepherd and Bishop, her King and her God.

9. for … glory of thy name [and for] thy name's sake—both mean for illustrating Thy attributes, faithfulness, power, &c.

purge … sins—literally, "provide atonement for us." Deliverance from sin and suffering, for their good and God's glory, often distinguish the prayers of Old Testament saints (compare Eph 1:7).