In this concluding message of the Jesus in the Feasts series, we reflect on the profound spiritual meaning in the Eighth Day, the final festival in God's annual cycle, revealing Christ as "our all in all." Drawing on the late Charles Whitaker's teaching on merism, a figure of speech in which opposites express totality, this sermon illustrates how the Eighth Day encapsulates the fullness and completeness of God's divine plan through Christ. Scripture gives few details about this day (Leviticus 23:33-36), but its Hebrew term Atzeret denotes closure, restraint, or retention, marking it as the capstone that concludes the Feast of Tabernacles and the entire festival season. Spiritually, it focuses upon Christ, who embodies and fulfills every lesson, hope, and promise depicted in the holy days-our Passover, Bread of Life, King Atonement, and Tabernacle—now summed up in Him who "fills all in all" (Ephesians 1:23). Through passages, including Ephesians 1 and Revelation 2, this message teaches that God's chosen saints as Christ's Body, share in His divine fulness. He is everything we need in every way, our power, holiness, and hope. In Revelation, Jesus declares Himself to be the Alpha and Omega, the beginning and the end, reassuring His people not to fear, but endure faithfully for He reigns and will return soon. Ultimately, the Eighth Day celebrates the completion of God's redemptive work, a vision of eternal unity with Christ, Who fills and perfects all things.