There is one body and one Spirit, just as you were called in one hope of your calling; (Ephesians 4:4, NKJV)
The work of the Holy Spirit and His presence in the body of Christ through it is a powerful ingredient of unity among believers. Through the new birth of “water and the Spirit” He gives life to our spirits and entrance into the kingdom of God (Jno. 3:3-5). We have access to the Father “by one Spirit” through the “word of truth, the gospel of (our) salvation” which He revealed, inspired, and miraculously confirmed (Eph. 2:18; 1:13; 3:3-6). When we are led by the Spirit, walking according to the truth He revealed, unity with God and with fellow Christians is attainable and sustainable (Gal. 5:16-18, 22-24). But, prospects of unity are doomed when we fail to live in the Spirit (that is, walk by His word, the gospel, Gal. 5:25-26). And so, we must take up “the sword of the Spirit, which is the word of God” and fight the good fight of faith to “keep the unity of the Spirit in the bond of peace” (Eph. 6:17; 1 Tim. 6:12; Eph. 4:3). The one Spirit has equipped us with truth – exactly what we need to protect the unity that belongs to Him and that He directs (Eph. 4:3). Let us walk in truth and rejoice in the unity it accomplishes.