20 I do not pray for these alone, but also for those who will believe in Me through their word; 21 that they all may be one, as You, Father, are in Me, and I in You; that they also may be one in Us, that the world may believe that You sent Me. (John 17:20–21, NKJV)
Jesus prayed for unity among believers. He is clear and succinct concerning the nature of that unity; “as You, Father, are in Me, and I in You; that they also may be one in Us.” There is no separation between the Father and the Son, no “agreeing to disagree” over revealed truth. There is no denominating the Father and the Son by name or any other measure of distinction. Why then, are many people convinced such things constitute unity, when demonstrably, they define division? Perhaps one reason is the unique failure to define unity on the basis of “their word” (the word of the apostles, v. 20). The same word that produces believers defines the unity of believers. There is “one faith” (Eph. 4:5). By it we are brought to faith in Christ, and by it we are all able to “be one” as the Father and Son are one (Rom. 1:16-17). Settling for anything less is not the unity for which Jesus prayed.