It is God who hath girded. This is a metaphor taken either from the belt or girdle of a warrior, or from the reins, in which the Scripture sometimes places a man's vigor or strength. It is, therefore, as if he had said, I, who would otherwise have been feeble and effeminate, have been made strong and courageous by the power of God. He afterwards speaks of the success itself with which God had favored him; for it would not be enough for persons to have prompt and active courage, nor even to excel in strength, if their undertakings were not at the same time crowned with a prosperous issue. Irreligious men imagine that this proceeds from their own prudence, or from fortune; but David ascribes it to God alone: It is God who hath made my way perfect. The word way is here to be understood of the course of our actions, and the language implies, that whatever David undertook, God, by his blessing, directed it to a successful issue.

It is God that girdeth me with strength - Who gives me strength. The word girdeth contains an allusion to the mode of dress among the orientals, the long flowing robe, which was girded up when they ran or labored, that it might not impede them; and, probably, with the additional idea that girding the loins contributed to strength. It is a common custom now for men who run a race, or leap, or engage in a strife of pugilism, to gird or bind up their loins. See Job 40:7, note; and Matthew 5:38-41, notes.
And maketh my way perfect - Gives me complete success in my undertakings; or, enables me so to carry them out that none of them fail.

God - girdeth me with strength - The girdle was a necessary part of the Eastern dress; it strengthened and supported the loins; served to confine the garments close to the body; and in it they tucked them up when journeying. The strength of God was to his soul what the girdle was to the body. I need not add, that the girdle was also an ornamental part of the dress, and from it the sword was suspended.
And maketh my way perfect - He directs me so that I do not go astray; he blesses me in my undertakings; and by him the issue of my labors is crowned with prosperity.

[It is] God that girdeth me with strength, and maketh my (z) way perfect.
(z) He gives good success to all my enterprises.

It is God that girdeth me with strength,.... For battle, as in Psalm 18:39; with strength of body and fortitude of mind; both which are from the Lord, and were in David; and were acknowledged by him as bestowed on him by the Lord; and which confirms what he had before said of him: or with spiritual strength, with strength in his soul, against sin, Satan, and the world; and to do the will and work of God: saints are girt by the Lord with the whole armour of God, and among the rest with the girdle of truth; and are prepared and ready to every good work; see 1-Samuel 2:4. Hannah's song is again referred to: in 2-Samuel 22:33, the words are, "God is my strength and power"; they are true of Christ, the man of God's right hand, whom he promised to strengthen, and whom he has made strong for himself, Psalm 80:17;
and maketh my way perfect; or safe, or prosperous. God removed every impediment and obstacle out of his way, and made it plain and easy, as Jarchi observes; and succeeded him, and gave him victory over his enemies; this has been verified in Christ, who has conquered sin, Satan, the world, death, and the grave: for this is not to be understood of the way and course of David's life and conversation, which was not perfect and unspotted, but had many blemishes and imperfections in it, which he often owns, confesses, and bewails.

Perfect - Perfectly plain and smooth, and clear from impediments.