John Calvin's Commentary on the Bible - Psalms 40:6
Verse 6 6In sacrifice and oblation thou hast not taken pleasure. Here David offers not only the sacrifice of praise, or, as the prophet Hosea calls it, (Hosea 14:2,) “the calves of the lips,” but, in token of his gratitude, offers and consecrates himself entirely to God; as if he had said, I am now wholly devoted to God, because, having been delivered by his wonderful power, I am doubly indebted to him for my life. At the same time, treating of the true worship of God, he shows that it consists... read more
Adam Clarke's Commentary on the Bible - Psalms 40:10
Thy faithfulness - This means the exact fulfillment of the promises made by the prophets relative to the incarnation of Christ, and the opening of the door of faith to the Gentiles. Loving-kindness - Shows the gift itself of Jesus Christ, the highest proof that God could give to a lost world of his mercy, kindness, and loving-kindness. read more