The most profound truth of the Bible is that “God is love” (1 John 4:8, 16). This is the most fundamental thing to be said about God, for it encompasses everything else that can be said about God. Peter Kreft explains this passage it this way:
Love is God’s essence. Nowhere else does Scripture express God’s essence in this way. Scripture says God is just and merciful, but it does not say that God is justice itself or mercy itself. It does say that God is love, not just a lover. Love is God’s very essence. Everything else is a manifestation of this essence to us, a relationship between this essence and us. This is the absolute; everything else is relative to it.
As Father, Son, and Holy Spirit, God eternally exists as perfect love. Each divine person within the godhead ascribes ultimate worth to the others. In doing this God is not being conceited but simply accurate. For as the one eternal uncreated reality, the triune community is the ultimate value, if you will, from which all created things derive value.
While we cannot clearly conceive of what the fellowship of the Father, Son, and Holy Spirit looked like prior to creation, we can discern its basic nature from the way God reveals himself to us in the person of Jesus Christ. In Christ, and throughout the New Testament, we learn that the fellowship of the three divine persons consists in mutual submission.
The triune fellowship is Christ-like. The Father, Son, and Holy Spirit ascribe ultimate worth to one another without any competition. Their eternal life together consists in the divine joy of expressing the absolute value each has for the other.
The essence of this triune love is revealed in God’s love for humanity. The eternal, other-oriented love of the Father, Son, and Holy Spirit is revealed outside of God, as it were, in his love for humanity. God’s own inherent worth is expressed in the worth he ascribes to humanity, and it is truly breathtaking.
God expresses unsurpassable love for us and ascribes unsurpassable worth to us by sacrificing the One who has unsurpassable value on our behalf! And this unfathomable expression of love to us displayed the perfect love that the three divine persons have for one another.
God is toward us as he eternally is within himself: God is love.
—Adapted from Repenting of Religion, pages 25-26