The message to humanity in Jesus Christ is that Father can be trusted, that God is love and that you are included by the action of God in the Communion that is God. You belong because God has desired you and drawn you into Himself in the person of Jesus.
‘And this is the plan: At the right time he will bring everything together under the authority of Christ—everything in heaven and on earth’ Eph 1.10 NIV.
Unity in diversity is the nature of the trinity and the nature of the new creation.
The Doctrine of the Holy Trinity” is the foundation of the Christian faith. All the major doctrines of Christianity are rightly seen only in the light of the Doctrine of the Trinity.” (1)
Jesus Christ, the Living Word who is fully God and one with God is the logos – the personified divine rationale of the universe. Jesus Himself as the Word is the meaning and purpose of all that exists. He is the life of the world because He always was life. The law of the spirit of life is the triune God expressed in the cosmos, in you, in the church and society.
There is no law that exists in separation from God and never has been. The universe found its cohesion and purpose in the being of the trinity. Jesus lives to draw all thing into Himself because that’s where the life and purpose of all things originates. The law of the spirit of life is the trinity and the belonging of all that in relation to God.
Richard Rohr quoting Baxter Kruger with approval observes of the trinity  “
The stunning truth is that this triune God, in amazing and lavish love, determined to open the circle and share the Trinitarian life with others. This is the one, eternal and abiding reason for the creation of the world and of human life. There is no other God, no other will of God, no second plan, no hidden agenda for human beings.
“Before the creation of the world, the Father, Son and Spirit set their love upon us and planned to bring us to share and know and experience the Trinitarian life itself. Unto this end the cosmos was called into being, and the human race was fashioned, and Adam and Eve were given a place in the coming of Jesus Christ, the Father’s Son himself, in and through whom the dream of our adoption would be accomplished.” (2)
(1) Davis, Martin M.. The Christian Doctrine of God . AsiAfrica Ministries, Inc.. Kindle Edition.