In the Bible, oneness primarily refers to deep spiritual unity and relational harmony, whether between God and humanity, or among believers themselves. It is a foundational theme that emphasizes peace, shared purpose, and a harmonious bond transcending human differences.The Shema: In the Old Testament, Deuteronomy 6:4 establishes the foundational monotheistic belief: "Hear, O Israel: The Lord our God, the Lord is one." Union with Christ: In the New Testament, particularly in the Gospel of John, Jesus prays that His followers would experience the same kind of oneness with God that He experiences with the Father (John 17:21). This signifies living in complete alignment, love, and spiritual communion with the divine.Oneness in the Church (The Body of Christ) The New Testament emphasizes unity among believers as a reflection of God’s nature and a testimony to the world. The Early Church: Acts 2:44 describes the first believers as being "together and had all things in common," illustrating a practical, communal oneness. Transcending Divisions: In Galatians 3:28, the Apostle Paul writes that in Christ, "there is neither Jew nor Greek, there is neither slave nor free, there is no male and female, for you are all one in Christ Jesus." This type of oneness obliterates societal and cultural barriers. The word "oneness" is also at the center of a major theological debate regarding the nature of the Godhead. The Trinity: Traditional Christian theology views the "oneness" of God as a single essence eternally existing in three distinct, co-equal Persons: the Father, the Son, and the Holy Spirit. Oneness Theology: Conversely, a non-Trinitarian view called Oneness Theology (or Modalism) asserts that God is absolutely one in both essence and person. Adherents believe that the Father, Son, and Holy Spirit are simply different manifestations or modes of the one God, primarily revealed in the person of Jesus Christ. The oneness of the church is based on the oneness of God. We see it in verse 21: “. . . that they may all be one, just as you, Father, are in me, and I in you.” We also see it at the end of verse 22: “…that they may be one even as we are one.” Jesus is pointing back to the oneness (or unity) within God as the basis for the oneness (or unity) within the church. Here is where we must remember the doctrine of the Trinity. There is one God (1 Tim. 2:5). And within the one Being that is God, there eternally exists three co-equal, co-eternal Persons: Father, Son, and Holy Spirit (Matt. 28:19). The Bible clearly teaches that the Father is God, that Jesus is God, and that the Holy Spirit is God. They are distinct from one another. And yet, those three Persons are so united that it can truly be said that God is one. And that oneness is the basis for the oneness that Jesus speaks of concerning the church. This is why unity in the church is so important, because of what it says about God.