John Gill Bible Commentary
My soul melteth for heaviness,.... Like wax before the sun or fire; or flows like water; drops (a), as the word signifies, and dissolves into tears, through grief and sorrow for sins committed; or by reason of Satan's temptations, or divine desertions, or grievous troubles and afflictions; which cause heaviness, lie heavy, and press hard;
strengthen thou me according unto thy word; to oppose corruptions, withstand temptations, bear up under trials and afflictions, and do the will of God. And the word of God is a means of strengthening his people to do these things; it is the spiritual bread which strengthens man's heart, and in the strength of which, like Elijah, he walks many days, and goes from strength to strength: and there are many gracious words of promise, which may be pleaded with God to this purpose; that he will help, strengthen, and uphold his people; that he will renew their strength, and that as their day is their strength shall be.
(a) "stillavit"; Pagninus, Montanus; "distillet", Vatablus; "stillat", Junius & Tremellius, Piscator, Cocceius, Michaelis.
Matthew Henry Bible Commentary
We have here, 1. The great intimacy and freedom that had been between David and his God. David had opened his case, opened his very heart to God: "I have declared my ways, and acknowledged thee in them all, have taken thee along with me in all my designs and enterprises." Thus Jephthah uttered all his words, and Hezekiah spread his letters, before the Lord. "I have declared my ways, my wants, and burdens, and troubles, that I meet with in my way, or my sins, my by-ways (I have made an ingenuous confession of them), and thou heardest me, heardest patiently all I had to say, and tookedst cognizance of my case." It is an unspeakable comfort to a gracious soul to think with what tenderness all its complaints are received by a gracious God, Jo1 5:14, Jo1 5:15. 2. David's earnest desire of the continuance of that intimacy, not by visions and voices from heaven, but by the word and Spirit in an ordinary way: Teach me thy statutes, that is, Make me to understand the way of thy precepts. When he knew God had heard his declaration of his ways he did not say, "Now, Lord, tell me my lot, and let me know what the event will be;" but, "Now, Lord, tell me my duty; let me know what thou wouldst have me to do as the case stands." Note, Those who in all their ways acknowledge God may pray in faith that he will direct their steps in the right way. And the surest way of keeping up our communion with God is by learning his statutes and walking intelligently in the way of his precepts. See Jo1 1:6, Jo1 1:7. 3. The good use he would make of this for the honour of God and the edification of others: "Let me have a good understanding of the way of thy precepts; give me a clear, distinct, and methodical knowledge of divine things; so shall I talk with the more assurance, and the more to the purpose, of thy wondrous works." We can talk with a better grace of God's wondrous works, the wonders of providence, and especially the wonders of redeeming love, when we understand the way of God's precepts and walk in that way.