How do we know Christ is the Messiah as foretold in Isaiah?

The certainty that Christ is the Messiah is rooted in the prophecies of the Old Testament, with Isaiah 9:6 being a primary text that foretells His coming. In the fullness of time, as detailed in Galatians 4:4, God sent His son as prophesied, confirming the predictions made centuries before in Isaiah and others. The miracles performed by Jesus, His fulfillment of the law, and the authority He displayed throughout His ministry further affirm His identity as the long-awaited Savior. The early church recognized this truth, understanding that Jesus’ life and work embodied the prophecies that pointed to Him, thus aligning with the sovereign grace of God.