I will never forget thy statutes. This verse contains a thanksgiving. As the law of the Lord had preserved him, he engages that he will never forget it. Yet he, at the same time, admonishes himself and others how necessary it is to cherish in the heart the remembrance of the Divine Law; for though we have found from experience its life-giving power, yet we easily allow it to pass from our memories, and on this account God afterwards justly punishes us, by leaving us for a long time to languish in our sadness.

I will never forget thy precepts - Thy laws; thy truth. I will bear them in mind forever. To all eternity they shall be the object of my meditation.
For with them thou hast quickened me - By them thou hast given me life, spiritual life. Compare the notes at James 1:18. This is stated as a reason why he would never suffer the truth of God to pass out of his mind. By that truth he had been made really to live. He had been brought from spiritual death to spiritual life. He saw before him now, as the result of that, an endless career of blessedness. How could he ever forget what had worked such a change in his character and condition; which had inspired such hopes; which had opened before him such an immortal career of glory!

I will never forget thy precepts - How can I? It is by them I live.

I will never forget thy precepts,.... Not the precepts of the moral law, though he carefully observed and attended to them, laid them up in his mind, and did not forget to keep them; but the doctrines of the word, of the word which the Lord commanded to a thousand generations; these he endeavoured to remember, and not let them slip from him, since it follows:
for with them thou hast quickened me: not with the precepts of the moral law, which cannot give life, quicken a dead sinner, nor comfort a distressed saint it is the killing letter, and the ministration of condemnation and death: but the doctrines of the word, of the Gospel, which are spirit and life; the savour of life unto life, the means of quickening dead sinners, and of reviving drooping saints; of refreshing their spirits, and cheering their souls, when in distress: and when they are made thus useful, they are not easily forgotten, they leave impressions which do not soon wear off; and besides, saints are careful to remember such words and truths, which have been of use unto them, since they may have occasion for them again.

The bounds of created perfection may be defined, but those of God's law in its nature, application, and influence, are infinite. There is no human thing so perfect but that something is wanting to it; its limits are narrow, whereas God's law is of infinite breadth, reaching to all cases, perfectly meeting what each requires, and to all times (Psalm 19:3, Psalm 19:6-11; Ecclesiastes 3:11). It cannot be cramped within any definitions of man's dogmatical systems. Man never outgrows the Word. It does not shock the ignorant man with declared anticipations of discoveries which he had not yet made; while in it the man of science finds his newest discoveries by tacit anticipations provided for.