The moral law requires obedience, but gives no strength (as Pharaoh required brick, but gave no straw), but the gospel gives strength; it bestows faith on the elect; it sweetens the law; it makes us serve God with delight.The Ten Commandments, 44
Redemption means to secure the release or recovery of persons or things by the payment of a price. It is a covenantal legal term closely associated with ransom, atonement, substitution, and deliverance, thus salvation. Theologically, redemption refers ultimately to the saving work of Christ, who came to accomplish our redemption by giving his life in substitution for our own as the ransom price.https://www.thegospelcoalition.org/essay/redemption/
The Law with its function does contribute to justification - not because it justifies, but because it impels one to the promise of grace and makes it sweet and desirable. Therefore we do not abolish the Law; but we show its true function and use, namely, that it is a most useful servant impelling us to Christ; for its function and use is not only to disclose the sin and wrath of God but also to drive us to Christ. Therefore the principal purpose of the Law in theology is to make men not better but worse; that is, it shows them their sin, so that by the recognition of sin they may be humbled, frightened, and worn down, and so may long for grace and for the Blessed Offspring.
Redemption (apolutrósis) refers supremely to the work of Christ on our behalf, whereby he purchases us, he ransoms us, at the price of his own life, securing our deliverance from the bondage and condemnation of sin. The New Testament speaks of Christ's saving work in this way frequently.https://www.thegospelcoalition.org/essay/redemption/
both Torah and Messiah are essential for God's people. Law cannot function properly in the life of God's people without Messiah and Messiah can be properly appreciated only in the context of the LORD's law. Law and gospel must be joined together if God's people tare to experience the full "blessed" condition that comes from the LORD (Pss. 1:1; 2:12; 119:1-2).The Flow of the Psalms, Ch 9
When God originally gave his commands to Adam and Eve in the garden, he gave those commands to them as blessings. They weren't things upon which his love was contingent. He loved them and blessed them in the garden. And their obedience to the commands was the very sphere in which they enjoyed that blessedness. And when we are saved by Christ, when we are united to Christ, we are able to walk in a manner that is worthy of the gospel. We are to live in a manner that is like the Lord Jesus Christ. And he delighted in obeying God. And so the law of God shows us what that life of peace and blessedness is like. It shows us what it's like to live a life worthy of the gospel once we've trusted in Jesus Christ.
What is the difference between the moral law and the gospel? (I) The law requires that we worship God as our Creator; the gospel, that we worship him in and through Christ.The Ten Commandments, 43
To run, to work, the law commands, The gospel gives me feet and hands. The one requires that I obey, The other does the power convey.Ralph Erskine, Gospel Sonnets or Spiritual Songs (Edinburgh: John Pryde, 1870), 288- 89