I will keep thy law continually He resolves to devote himself to the study of the law, not for a short time only, but even to the termination of his life. The employing of three synonymous words, tmyd, tamid, vlm, olam, d, ed, so far from being viewed as a superfluous accumulation of terms, contains an implied indication, that, unless the faithful make a strenuous and steady opposition, the fear of God may be gradually effaced from their minds by various temptations, and they will lose the affection which they bear for the law. In order, therefore, that he may be the better prepared for meeting these trials, he alludes to the difficulty and danger connected with them. The next verse may be read as expressing a desire that he might walk. Be this as it may, we retain the commonly received reading, That David exults at the thought of his path becoming plain and easy, in consequence of his seeking diligently after God's precepts; that is, to walk at ease The ways of men are frequently rugged and obstructed, because they themselves lay various stumblingblocks in them, or entangle themselves in many inextricable windings. Hence it comes to pass, that while none will submit to the word of God as their rule, every man endures the punishment legitimately due to such arrogance. On all sides God lays snares for us, puts pitfalls in our way, causes us to fall in with paths broken and rugged, and at last shuts us up in a bottomless pit: and by how much the more politic a mart is, by so much the more will he meet with obstructions in his path. This verse teaches us that, if any man yield implicit obedience to God, he will receive this as his reward, that he shall walk with a calm and composed mind; and should he meet with difficulties, he will find the means of surmounting them. The faithful, however readily and submissively they give themselves up to God, may happen to find themselves involved in perplexity; nevertheless, the end contemplated by Paul is accomplished, that though they be in trouble and toil, yet they do not continue in irremediable distress, because it is the duty (so to speak) of God to point out a way for them where there seems to be no way, (2-Corinthians 4:8.) Moreover, when grievously oppressed, even then they walk at ease, for they commit the doubtful issue of events to God in such a manner, that, having him for their guide, they have no doubt they will come out boldly from the depths of distress.

So shall I keep thy law continually forever and ever - At all times and in all places; in this world and the world to come. This indicates a purpose to do it, and an assurance that he would do it, if God should enable him to retain even the slightest hold on the truth.

So shall I keep thy law continually,.... Which denotes not the perfection of keeping the law, but the constancy of it: the psalmist was persuaded, that so long as he had the word of truth in his mouth, and the judgments of God in his view, he should be diligent and constant in the discharge of his duty, which these directed and encouraged him unto;
for ever and ever; in this life and that to come; when the law of God will be kept, and his will done perfectly by the saints, as it now is by the angels in heaven; or this may be connected with the law of God; which law is for ever and ever, being of eternal duration and obligation. The whole may be understood of the law of faith, or doctrine of the Gospel, and be rendered, "so shall I observe thy doctrine continually"; contained in the word of truth; which doctrine is for ever and ever, it is the everlasting Gospel.