Unity among believers is important for three key reasons: 1) God bestows blessings on those who are united, as seen in examples of oil and dew being symbols of unity. 2) Unity is the heartbeat of Jesus, as our unity in purpose and spirit through acknowledging Jesus as Lord witnesses to the world. 3) There is power in unity, as united believers can accomplish more and have strength against the devil's attempts to cause division, while division weakens the church's impact.