“These are sensual persons, who cause divisions, not having the Spirit” (Jude 19).
The Spirit of God is essential to unity. The gloriously good and pleasant fruit of unity is only enjoyed by those who seek to walk worthy of their calling. Lowliness, gentleness, being longsuffering, bearing with one another, and endeavoring to keep the unity of the Spirit in the bond of peace (Ephesians 4:1-3) are essential to unity.
Biblical unity which the Spirit of truth provides and Christians are to keep is based upon the truth. It is not gained at the expense of truth. The same truth which sanctifies Christ’s disciples (John 17:17) as the one body is the one faith which provides the common salvation and was once for all delivered to the saints (Jude 3).
As so clearly demonstrated in the first four chapters of First Corinthians, sensual people cause divisions. Having a partisan (1Corinthians 1:11-12), carnal (1 Corinthians 3:1-4), petty spirit which does not receive the spiritual things revealed by the Spirit of God (1 Corinthians 2:6-15) results in contentions and schisms, not the mind of Christ (1 Corinthians 2:16).
Unity prevails when the members of Christ’s body do nothing from the sensual motives of selfish ambition or conceit. Instead, in lowliness of mind they esteem others better than themselves; they are ever on the lookout for the interests of others (Philippians 2:3-4).
Ungodly change agents draw lines of fellowship God has not because they walk according to their own lusts and mouth great swelling words (Jude 16). This creates division and destroys unity.