Psalms 6:2

Then when he says "Have mercy," he asks to be freed from the second, namely from the wounding and weakness of nature. And first he explains the infirmity in general; second in particular, at "Heal," etc. He says therefore, "Have mercy on me, Lord, for …

The spirit of a man will sustain his infirmity, if that be in good plight; but, if that be wounded, the grievance is intolerable. David's sickness brought his sin to his remembrance, and he looked upon it as a token of God's displeasure against him; that was the vexation of his soul; that made him cry, I am weak, heal me.

Have mercy upon me, O Lord,....

Those that will not give glory to God shall have their faces filled with everlasting shame. In singing this, and praying over it, we must give glory to God, as a God ready to hear prayer, must own his goodness to us in hearing our prayers, and must encourage ourselves to wait upon him and to trust in him in the greatest straits and difficulties.

Have mercy - I have no merit. I deserve all I feel and all I fear. O Lord, heal me - No earthly physician can cure my malady. Body and soul are both diseased, and only God can help me. I am weak - אמלל umlal. I am exceedingly weak; I cannot take nourishment, and my strength is exhausted. My bones are vexed - The disease hath entered into my bones.

"Have mercy upon me, O Lord; for I am weak." Though I deserve destruction, yet let thy mercy pity my frailty. This is the right way to plead with God if we would prevail. Urge not your goodness or your greatness, but plead your sin and your littleness. Cry, "I am weak, " therefore, O Lord, give me strength and crush me not. Send not forth the fury of thy tempest against so weak a vessel. Temper the wind to the shorn lamb. Be tender and pitiful to a poor withering flower, and break it not from its stem.

"O Lord, heal me; for my bones are vexed." Here he prays for healing, not merely the mitigation of the ills he endured, but their entire removal, and the curing of the wounds which had arisen therefrom. His bones were "shaken, " as the Hebrew has it. His terror had become so great that his very bones shook; not only did his flesh quiver, but the bones, the solid pillars of the house of manhood, were made to tremble. "My bones are shaken."

"Have mercy upon me, O Lord; for I am weak." Though I deserve destruction, yet let thy mercy pity my frailty. This is the right way to plead with God if we would prevail. Urge not your goodness or your greatness, but plead your sin and your littleness. Cry, "I am weak, " therefore, O Lord, give me strength and crush me not. Send not forth the fury of thy tempest against so weak a vessel. Temper the wind to the shorn lamb. Be tender and pitiful to a poor withering flower, and break it not from its stem. Surely this is the plea that a sick man would urge to move the pity of his fellow if he were striving with him, "Deal gently with me, 'for I am weak.'" A sense of sin had so spoiled the Psalmist's pride, so taken away his vaunted strength, that he found himself weak to obey the law, weak through the sorrow that was in him, too weak, perhaps, to lay hold on the promise. "I am weak." The original may be read, "I am one who droops, " or withered like a blighted plant. Ah! beloved, we know what this means, for we, too, have seen our glory stained, and our beauty like a faded flower.

Have mercy upon me, O Lord - That is, be gracious to me; or, show me compassion. This language may be used either in view of sin, of suffering, or of danger. It is a cry to God to interpose, and remove some present source of trouble, and may be employed by one who feels that he is a sinner, or by one on a bed of pain, or by one surrounded by enemies, or by one at the point of death, or by one who is looking out with apprehension upon the eternal world. It is commonly, indeed (compare Psa 51:1), a cry to God in view of sin, pleading for pardon and salvation; but here it is a cry in view of trouble and danger, outward sorrow and mental anguish, that had overcome the strength of the sufferer and laid him on a bed of languishing. See introduction to the psalm, Section 3. For I am weak - The original word here, אמלל 'ûmlal, means properly to languish or droop, as plants do that are blighted, Isa 24:7, or as fields do in a drought, Isa 16:8, and is here applied to a sick person whose strength is withered and gone. The condition of such an one is beautifully compared with a plant that withers for lack of moisture; and the word is used in this sense here, as referring to the psalmist himself when sick, as the result of his outward and mental sorrows. Such an effect has not been uncommon in the world. There have been numberless cases where sorrow has prostrated the strength - as a plant withers - and has brought on languishing sickness. O Lord, heal me - This is language which would be properly applied to a case of sickness, and therefore, it is most natural to interpret it in this sense in this place. […]