Means of grace are creaturely media through which the Spirit delivers Christ and all of His benefits. We are effectually called into union with Christ by the preaching of the gospel. Through this ministry of the Word, the Spirit gives us faith in Christ. He further ratifies His gracious promise by baptism and the Lord’s Supper, the signs and seals of the covenant of grace.
Means of gratitude are our appropriate response to the gift that is given to us through the means of grace. Chief among these is prayer, as well as witness, mutual instruction and admonition (including through singing [Colossians 3.16]), church discipline, meditation on God’s Word, and service to others (our families, fellow saints, and neighbors).
From: Pilgrim Theology: Core Doctrines for Christian Disciples by Michael Horton (Grand Rapids: Zondervan, 2011), p. 344.