I have restrained my feet from every evil path He intimates that he proclaimed war against every vice, that he might wholly devote himself to the service of God. From this we learn the profitable lesson, that in order to our keeping God's Law, we must, from the commencement, beware lest our feet should step aside into crooked by-paths; for with a nature so corrupted as ours is, amidst so many allurements, and with minds so fickle, we are in the greatest danger of being led astray; yea, it is a rare miracle if any man hold on in his life in a right course, without turning aside in one direction or another. The faithful, therefore, have need to exercise the greatest circumspection, in order to keep their feet from going astray. In the next verse, David commends his own constancy in observing the Law. He declares that ever since he had learned from God the right manner of living, he had pursued the right course. As the way is so slippery, and our feet so feeble, and our whole disposition so prone to go astray after innumerable errors, no small exertions are requisite on our part, in order to avoid declining from God's judgments. But we must attend to the manner of teaching to which the Psalmist refers; for though all, without exception, to whom God's word is preached, are taught, yet scarce one in ten so much as tastes it; yea, scarce one in a hundred profits to the extent of being enabled, thereby, to proceed in a right course to the end. A peculiar manner of teaching is, therefore, here pointed out -- that which consists in God's drawing his chosen people to himself. I have been brought, as if the Psalmist had said, into the way of salvation, and preserved in it by the secret influence of the Holy Spirit.

I have refrained my feet from every evil way - I have walked in the path which thy law marks out. I have avoided the way of wickedness, and have not yielded to the seductions of a sinful life.
That I might keep thy word - I have avoided all those allurements which would turn me from obedience, and which would prevent a right observance of thy commands. This indicates a purpose and a desire to keep the law of God, and shows the method which he adopted in order to do this. That method was to guard against everything which would turn him from obedience; it was, to make obedience to the law of God the great aim of the life.

I have refrained my feet - By avoiding all sin, the spirit of wisdom still continues to rest upon me.

I have refrained my feet from every evil way,.... Of error or immorality, forbidden and condemned by the word of God; every way that is evil in itself, or leads to evil, and in which evil men walk; and though there may be many snares and temptations to walk in such a way, yet a good man cannot allow himself to walk therein, as others do; he has not so learned the word of God; he is under the influence of divine grace, and withholds himself from it; he abstains from all appearance of evil, and lays a restraint, as upon his mouth and lips, so upon his feet, or guards his walk and conversation. This shows, that as David had an affection for the word of God, and made great proficiency in knowledge by it; so it had an influence on his life and conversation, and his knowledge appeared to be not merely speculative, but practical: his end, in laying such a restraint upon his feet, was not out of vain glory, and to gain popular applause nor through fear of losing his credit among men, nor of the wrath of God; but out of love to God, and to his word, as follows:
that I might keep thy word; such was his love to it, and his regard to the honour of it; considering whose word it was, and with whose authority it was clothed, and whose glory was concerned therein; that he was careful to walk according to it, and in the way that directed to, and shun every other way.

Avoidance of sinful courses is both the effect and means of increasing in divine knowledge (compare Psalm 19:10).