Introduction:
The phrase "He Who Lives Forever and Ever" is a profound biblical title that emphasizes the eternal nature and sovereignty of God. This title is found primarily in the book of Revelation and is used to describe God's unending existence and His supreme authority over all creation.

Biblical References:
The title "He Who Lives Forever and Ever" appears prominently in the book of Revelation, a text rich with imagery and symbolism that reveals the ultimate victory of God over evil. In Revelation 4:9-10 , the twenty-four elders fall down before Him who sits on the throne and worship Him who lives forever and ever, casting their crowns before the throne. This act of worship underscores the recognition of God's eternal reign and His worthiness to receive glory and honor.

Revelation 10:6 further emphasizes this eternal nature, where the mighty angel swears by Him who lives forever and ever, who created heaven and everything in it, the earth and everything in it, and the sea and everything in it. This declaration affirms God's role as the Creator and Sustainer of all things, highlighting His timeless existence and ultimate authority.

Theological Significance:
The title "He Who Lives Forever and Ever" encapsulates the doctrine of God's eternality, a fundamental attribute of His divine nature. Unlike created beings, God is not bound by time; He exists outside of it, having neither beginning nor end. This eternal nature is a source of comfort and assurance for believers, as it affirms that God's promises and purposes are unchanging and everlasting.

In the context of worship, acknowledging God as "He Who Lives Forever and Ever" calls believers to a posture of reverence and awe. It reminds the faithful of their place within God's eternal plan and the transient nature of earthly life. The worship of God as the eternal King is a central theme in Christian liturgy and personal devotion, reflecting the belief in His unending dominion and the hope of eternal life with Him.

Relation to Other Biblical Themes:
The concept of God's eternal nature is interwoven with other biblical themes, such as His immutability, omnipotence, and omniscience. Scriptures like Psalm 90:2 declare, "Before the mountains were born or You brought forth the earth and the world, from everlasting to everlasting You are God." This verse, along with others, reinforces the understanding that God's eternal existence is foundational to His character and His relationship with creation.

Furthermore, the eternal nature of God is a key element in the eschatological hope of Christians. The promise of eternal life, as offered through Jesus Christ, is rooted in the belief in a God who transcends time and offers a share in His eternal kingdom to those who believe.

Conclusion:
The title "He Who Lives Forever and Ever" serves as a powerful reminder of God's eternal sovereignty and His unchanging nature. It calls believers to worship, trust, and hope in the One who reigns supreme over all creation, from everlasting to everlasting.