What is the difference between oneness and unity? When we look at the definitions of the words “oneness” and “unity” there are many similarities. However, one definition in each stands out:
unity-absence of diversity
We can clearly see the difference when we look at these two definitions. For example, two or more that make up a group can be unified in a cause or mission. That group can display an absence of diversity. They think, dress, act, and talk alike, such as a unit of soldiers. Yet individually, they would not seem to be unique.
However, in a marriage, you have two totally different kinds of people, two different species of humanity, if you will, coming together as one. Scripture tells us, “...and the two shall become one flesh” (Ephesians 5:31b). Displaying total diversity but still one; each completely unique. And the Lord wants oneness in marriage in the same way He wants the oneness of the Church with Himself. Father and Son are One (see John 10:30), and He wants that oneness with us. John 17:22 says, “And the glory which You gave Me I have given them, that they may be one just as We are one.” Nothing causes oneness in a marriage like having Jesus as the center, the focal point, of that marriage. Any group of people can have unity, but Jesus is the only way to oneness in marriage and with God.