It has been said that the most valuable tool possessed by the evil one is the wedge.  If he can drive it between brothers and sisters in Christ on an individual or a group level, he hinders the cause of Christ through the fragmentation and factions that result.  If believers are expending their energy in internal attacks, criticism, envy, jealousy, slander, and bitterness, they will be ill-prepared to withstand external opposition.  Spiritual maturity and victory depend on maintaining “one spirit, with one mind,” or as Paul put it in another epistle written during his first Roman imprisonment, “being diligent to preserve the unity of the Spirit in the bond of peace.  There is one body and one Spirit, just as also you were called in one hope of your calling; one Lord, one faith, one baptism, one God and Father of all who is over all and through all and in all” (Eph. 4:3-6).