| Barnes' Notes on the Bible 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.
Clarke's Commentary on the BibleI have refrained my feet - By avoiding all sin, the spirit of wisdom still continues to rest upon me.
Gill's Exposition of the Entire BibleI 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.
Geneva Study BibleI have refrained my feet from every evil way, that I might keep thy word.
Jamieson-Fausset-Brown Bible Commentary101-104. Avoidance of sinful courses is both the effect and means of increasing in divine knowledge (compare Ps 19:10).
Matthew Henry's Concise Commentary119:97-104 What we love, we love to think of. All true wisdom is from God. A good man carries his Bible with him, if not in his hands, yet in his head and in his heart. By meditation on God's testimonies we understand more than our teachers, when we understand our own hearts. The written word is a more sure guide to heaven, than all the fathers, the teachers, and ancients of the church. We cannot, with any comfort or boldness, attend God in holy duties, while under guilt, or in any by-way. It was Divine grace in his heart, that enabled the psalmist to receive these instructions. The soul has its tastes as well as the body. Our relish for the word of God will be greatest, when that for the world and the flesh is least. The way of sin is a wrong way; and the more understanding we get by the precepts of God, the more rooted will be our hatred of sin; and the more ready we are in the Scriptures, the better furnished we are with answers to temptation.
Matthew Henry's Whole Bible CommentaryVerse 101 Here is, 1. David's care to avoid the ways of sin: "I have refrained my feet from the evil ways they were ready to step aside into. I checked myself and drew back as soon as I was aware that I was entering into temptation." Though it was a broad way, a green way, a pleasant way, and a way that many walked in, yet, being a sinful way, it was an evil way, and he refrained his feet from it, foreseeing the end of that way. And his care was universal; he shunned every evil way. By the words of thy lips I have kept myself from the paths of the destroyer, Ps. 17:4. 2. His care to be found in the way of duty; That I might keep thy word, and never transgress it. His abstaining from sin was, (1.) An evidence that he did conscientiously aim to keep God's word and had made that his rule. (2.) It was a means of his keeping God's word in the exercises of religion; for we cannot with any comfort or boldness attend on God in holy duties, so as in them to keep his word, while we are under guilt or in any by-way. | 
