Psalms 40:8

The psalmist foretells that work of wonder, redemption by our Lord Jesus Christ. The Substance must come, which is Christ, who must bring that glory to God, and that grace to man, which it was impossible the sacrifices should ever do. Observe the setting apart of our Lord Jesus to the work and office of Mediator. In the volume, or roll, of the book it was written of him. In the close rolls of the Divine decrees and counsel, the covenant of redemption was recorded. Also, in all the volumes of the Old Testament something was written of him, Joh 19:28. Now the purchase of our salvation is made, the proclamation is sent forth, calling us to come and accept it. It was preached freely and openly. Whoever undertook to preach the gospel of Christ, would be under great temptation to conceal it; but Christ, and those he calls to that work, are carried on in it. May we believe his testimony, trust his promise, and submit to his authority.

I delight to do thy will, O my God. Our blessed Lord alone could completely do the will of God. The law is too broad for such poor creatures as we are to hope to fulfil it to the uttermost: but Jesus not only did the Father's will, but found a delight therein; from old eternity he had desired the work set before him; in his human life he was straitened till he reached the baptism of agony in which he magnified the law, and even in Gethsemane itself he chose the Father's will, and set aside his own. Herein is the essence of obedience, namely, in the soul's cheerful devotion to God: and our Lord's obedience, which is our righteousness, is in no measure lacking in this eminent quality. Notwithstanding his measureless griefs, our Lord found delight in his work, and for "the joy that was set before him he endured the cross, despising the shame." Yea, thy law is within my heart. No outward, formal devotion was rendered by Christ; his heart was in his work, holiness was his element, the Father's will his meat and drink. We must each of us be like our Lord in this, or we shall lack the evidence of being his disciples. Where there is no heart work, no pleasure, no delight in God's law, there can be no acceptance. Let the devout reader adore the Saviour for the spontaneous and hearty manner in which he undertook the great work of our salvation.