If some terrible and all consuming fire devoured all created things, including the universe, angelic and human beings, and all physical reality, that which would remain would be the Father, the Son, and the Holy Spirit. God would remain.
"I am the LORD, and there is none else" (Isaiah 45:5).
Only God exists independently, in and of Himself. "From everlasting" He dwelt in and as His triune being, three glorious and ineffable Persons united in One, relating to each other in the perfection of Divine Love, and completely fulfilled and without need for anything or anyone. "From everlasting to everlasting, Thou art God" (Psalm 90:2). The heart of reality, therefore, is God and God alone, or God and God not alone in the glorious relationship of Father, Son, and Holy Spirit.
We need to often retreat in our hearts and minds to this core truth and essence. We do so not to understand, but to bow in the redeeming and enlivening truth that tells us we cannot understand. No greater light shines upon us and into us than the blinding and illuminating glory of "I am the Lord and there is none else." We lose ourselves in the fiery blaze of Divine glory, only to find ourselves in the enveloping warmth of Divine goodness expressed among Three "from everlasting," but now known by multitudes "to everlasting." Indeed, perhaps the most amazing prayer uttered in Scripture, a request of the Lord Jesus, beckons the Father to call us into an eternally ancient wonder of Love beyond any glory we can presently begin to ponder:
"Father, I will that they also, whom Thou hast given Me, be with Me where I am; that they may behold My glory, which Thou hast given Me: for Thou lovedst Me before the foundation of the world. O righteous Father, the world hath not known Thee: but I have known Thee, and these have known that Thou hast sent Me. And I have declared unto them Thy name, and will declare it: that the love wherewith Thou hast loved Me may be in them, and I in them" (John 17:24-26).
There is no depth low enough wherein we can bow heart and knee to adequately humble ourselves in acknowledging the grace of this prayer. Nor is there any summit high enough to adequately express the exaltation to which our Lord Jesus has redeemed us. Forever the trusting sons and daughters of God in Christ will seek those depths even as our Father joyfully meets us in those summits. We were dust, and even more, we were sinful dust. Now we are family, redeemed unto Blood-bought and Spirit-birthed relationship with the Father, the Son and the Holy Spirit. No depth low enough, no summit high enough...
"But God, who is rich in mercy, for His great love wherewith He loved us, even when we were dead in sins, hath quickened us together with Christ, (by grace ye are saved;) and hath raised us up together, and made us sit together in heavenly places in Christ Jesus: that in the ages to come He might show the exceeding riches of His grace in His kindness toward us through Christ Jesus."