To be in them the love which I loved by him "(Jn 17:26)
When St. John the Apostle wrote that "God is love" (1 John 4: 8, 16), he meant that God could not be without his nature of love.
Rather, the nature of God is love, just as it is right, righteousness, power, and wisdom.
Love is at the core of the essence and nature of God from eternity.
Therefore, we can not imagine that the Father will exist without the Son and the Holy Spirit.
Love requires the presence of more than one hypostasis to exchange these loving universes among themselves.
If God the Father existed in absolute individuality from eternity, we could not say that "God is love" (1 John 4: 8, 16)