The principle of unity is inherent in God as the "Shema Israel" (Deuteronomy 6:4-9) points out by stating that the Lord is God and the Lord is ONE. In the beginning (Genesis 1) Heaven and Earth were ONE, or united, and humans walked in the presence of God. The same principle of unity is "stamped" so to say in everything God creates... and although sin cause division in the created, there is still enough evidence in creation, experience and obviously revelation, of our purpose in being created for unity/ union. This is manifested in Jesus' prayer in John 17, revealing both His desire for us to live on unity and His nature of union with the Father. The highest participation of humans in the divine act of creation is pro-creation and thus, it is no surprise that this also reveals the principle of union in the Creator/ created by the necessary union of man and woman. Holiness is often understood in the Christian world as Union with God, and I consider it to be the best definition by far since it is not only consistent with th principle of union revealed in the Scriptures but also in the created. I don't consider John 17,22 to be simply an allusion to Genesis 2,24 but rather another further revelation of God's nature and if His "modus operandi" in creation. Scripture and nature (material and spiritual) are both consistent with the ancient prayer of Israel... the Lord is One, and we, created in His image and likeness, are meant to be clear manifestations of this unity- with self, with others, with the cosmos and with God Himself, as He meant it from the beginning.

The principle of unity is inherent in God as the "Shema Israel" points out by stating that the Lord is God and the Lord is ONE:

[Deu 6:4-9 ESV] (4) "Hear, O Israel: The LORD our God, the LORD is one. (5) You shall love the LORD your God with all your heart and with all your soul and with all your might. (6) And these words that I command you today shall be on your heart. (7) You shall teach them diligently to your children, and shall talk of them when you sit in your house, and when you walk by the way, and when you lie down, and when you rise. (8) You shall bind them as a sign on your hand, and they shall be as frontlets between your eyes. (9) You shall write them on the doorposts of your house and on your gates.

In the beginning (Genesis 1) Heaven and Earth were ONE, or united, and humans walked in the presence of God.

The same principle of unity is "stamped" so to say in everything God creates... and although sin cause division in the created, there is still enough evidence in creation, experience and obviously revelation, of our purpose in being created for unity/ union. This is manifested in Jesus' prayer in John 17, revealing both His desire for us to live on unity and His nature of union with the Father:

[Jhn 17:11 ESV] (11) And I am no longer in the world, but they are in the world, and I am coming to you. Holy Father, keep them in your name, which you have given me, that they may be one, even as we are one.

The highest participation of humans in the divine act of creation is pro-creation and thus, it is no surprise that this also reveals the principle of union in the Creator/ created by the necessary union of man and woman.

Holiness is often understood in the Christian world as Union with God, and I consider it to be the best definition by far since it is not only consistent with the principle of union revealed in the Scriptures but also in the created.

I don't consider John 17:22 to be simply an allusion to Genesis 2:24 but rather another further revelation of God's nature and if His "modus operandi" in creation. Scripture and nature (material and spiritual) are both consistent with the ancient prayer of Israel... the Lord is One, and we, created in His image and likeness, are meant to be clear manifestations of this unity- with self, with others, with the cosmos and with God Himself, as He meant it from the beginning.