In Clay Curtis's sermon titled "The Witness and Commander," the primary theological focus is on the person and work of Jesus Christ as the fulfillment of God’s covenant promises, particularly as expressed in Isaiah 55:4-6. Curtis emphasizes that Christ is both the witness to the people and their commander, illustrating how God offers an everlasting covenant to His chosen ones. He supports his arguments with multiple Scriptures, including Isaiah 53, Ephesians 1, and Romans 3:22, which demonstrate that Christ’s life, death, and resurrection accomplish the justification and salvation of His people. The practical significance of this sermon lies in the call for sinners to turn to Christ for mercy and forgiveness, underscoring the importance of faith in Him as the sole means of salvation, thus reinforcing core Reformed doctrines of grace and sovereignty.
Key Quotes
“Christ is salvation. He is salvation... this word is all about him. He is salvation. He is the covenant itself."
“God gave his son... He came to honor his law, to magnify his law, to declare his holy character.”
“He came to declare God’s righteousness... it’s not of him that willeth, it’s not of him that runneth, it’s of God that showeth mercy.”
“Seek ye the Lord while he may be found, call ye upon him while he is near.”
The Bible declares Christ as a witness to His people, revealing God's righteousness and character.
Christ is referred to as the ultimate witness in Scripture, where He reveals the holiness and righteousness of God. In Isaiah 55:4, it states that God gave Him for a witness to the people, indicating that all of God's messages and declarations to humanity come through Christ. This is further supported by John 1:14-18, where it emphasizes that the Word, Christ, was made flesh and reveals God to us. He is essential in helping us understand God’s nature and His plan of salvation, affirming His role as our mediator and the one who bears witness in our hearts.
Isaiah 55:4, John 1:14-18
We know Christ fulfills God's promises because of His resurrection and His glorious rule over all.
Christ's fulfillment of God's promises is evidenced by His resurrection and glorification. Isaiah 55 mentions the everlasting covenant and the sure mercies of David, which are guaranteed through Christ. Ephesians 1 elaborates on this by celebrating His resurrection power and His headship over the church. As believers, we can rest assured that His promises to save and keep His people are certain because He has accomplished the work required for our salvation through His life, death, and resurrection, affirming our justification and eternal security.
Isaiah 55:3, Ephesians 1:19-22
It is essential because salvation is based entirely on Christ's righteousness, not our works or efforts.
The Christian faith centers on the belief that salvation is a work of grace entirely attributed to Christ. Romans 3:10-12 and 3:21-26 reveal that we are all sinners, incapable of achieving righteousness through our efforts. Salvation can only come through Christ, who fulfilled the law and bore our sins as a propitiation for us. Thus, our reliance must be on His righteousness rather than our deeds, as our good works cannot justify us before a holy God. This underscores the need for faith in Christ alone for salvation and a life of continual dependence on Him.
Romans 3:10-12, Romans 3:21-26
Christ being a leader and commander means He guides and enables His people toward salvation and faith.
In Isaiah 55:4, Christ is presented as both a leader and a commander. This indicates His role in guiding His people toward salvation and leading them in the way of truth and righteousness. He commands His followers effectively, which is confirmed in Psalm 110, where it states that His people will be willing in the day of His power. His leadership involves not just instruction but also the transformation of our hearts, enabling us to respond in faith. Thus, our following Christ is not merely about obedience; it involves a transformation that He orchestrates within us.
Isaiah 55:4, Psalm 110
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