"The Law of the Lord is Perfect" Psalm 19:7

        "The law of the Lord is perfect;" by which he means not merely the law of Moses but the doctrine of God, the whole run and rule of sacred Writ. The doctrine revealed by God he declares to be perfect, and yet David had but a very small part of the Scriptures, and if a fragment, and that the darkest and most historical portion, be perfect, what must the entire volume be? How more than perfect is the book which contains the clearest possible display of divine love, and gives us an open vision of redeeming grace. The gospel is a complete scheme or law of gracious salvation, presenting to the needy sinner everything that his terrible necessities can possibly demand. There are no redundancies and no omissions in the Word of God, and in the plan of grace; why then do men try to paint this lily and gild this refined gold? The gospel is perfect in all its parts, and perfect as a whole: it is a crime to add to it, treason to alter it, and felony to take from it.
           "Converting the soul." Making the man to be returned or restored to the place from which sin had cast him. The practical effect of the Word of God is to turn the man to himself, to his God, and to holiness; and the turn or conversion is not outward alone, "the soul" is moved and renewed. The great means of the conversion of sinners is the Word of God, and the more closely we keep to it in our ministry the more likely we are to be successful. It is God's Word rather than man's comment on God's Word which is made mighty with souls. When the law drives and the gospel draws, the action is different but the end is one, for by God's Spirit the soul is made to yield, and cries, "Turn me, and I shall be turned." Try men's depraved nature with philosophy and reasoning, and it laughs your efforts to scorn, but the Word of God soon works a transformation.
           "The testimony of the Lord is sure." God bears his testimony against sin, and on behalf of righteousness; he testifies of our fall and of our restoration; this testimony is plain, decided, and infallible, and is to be accepted as sure. God's witness in his Word is so sure that we may draw solid comfort from it both for time and eternity, and so sure that no attacks made upon it however fierce or subtle can ever weaken its force. What a blessing that in a world of uncertainties we have something sure to rest upon! We hasten from the quicksands of human speculations to the terra firma of Divine Revelation.
          "Making wise the simple." Humble, candid, teachable minds receive the word, and are made wise unto salvation. Things hidden from the wise and prudent are revealed unto babes. The persuadable grow wise, but the cavillers continue fools. As a law or plan the Word of God converts, and then as a testimony it instructs; it is not enough for us to be converts, we must continue to be disciples; and if we have felt the power of truth, we must go on to prove its certainty by experience. The perfection of the gospel converts, but its sureness edifies; if we would be edified it becomes us not to stagger at the promise through unbelief, for a doubted gospel cannot make us wise, but truth of which we are assured will be our establishment.

- Charles H. Spurgeon "Treasury of David"