Behold, thou desirest truth in the inward parts,.... With delight and pleasure, as the word (d) signifies: meaning either Christ, the truth and the life, formed and dwelling in the hearts of his people; or the Gospel, the word of truth, which has a place there; and particularly that branch of it which proclaims pardon to sensible sinners, and is the ground of hope within them: or else a true and hearty confession of sin, which David now made; or rather internal holiness and purity of heart, in opposition to the corruption of nature before acknowledged: this is what is agreeable to the nature of God, is required by his holy law, and is wrought in the hearts of his people in regeneration; and this is "truth", real, and not imaginary, genuine and unfeigned; where it is there is a true sense of sin, a right sight of Christ, unfeigned faith in him, sincere love to him, hope in him without hypocrisy, and a reverential fear of God upon the heart; the inward parts are the seat of all this, and in the exercise of it the Lord takes great delight and pleasure; and in the hidden part thou shall make me to know wisdom; either Christ, the wisdom of God; or the Gospel, and particularly that part of it which concerns the pardon of sin; or a true knowledge of sin, and of the way of life and salvation by Christ, which is the truest and highest wisdom: and the phrase "hidden" or "secret" may either denote the nature of the wisdom made known, which is hidden wisdom, the wisdom of God in a mystery; or the manner in which it is made known; it is in a hidden way, privately, and secretly, and indiscernibly like the wind, by the Spirit and grace of God; or the seat and subject of it, "the hidden part", as we supply it; the hidden man of the heart. David begins to rise in the exercise of his faith in the grace of God, "thou shall make me to know", &c. unless the words should be rendered as a prayer, as they are by some, "make me to know" (e), &c. and as are the following. (d) "delectaris", Junius & Tremellius, Piscator; "delectatus es", Cocceius; so Ainsworth. (e) "notam mihi fac", Gejerus.