A body in which the blood does not circulate well is always below par, and fellowship corresponds to the circulation of the blood in the body of Christ. The church gains strength through fellowship, and loses strength without it... Christians today need fellowship. All Christians of every age do. None is spiritually self-sufficient; God does not make us so. Without fellowship, whether we are conscious of this or not, we shall be and remain feeble Christians. This is a law of the spiritual life.
(from God's Words, also 18 Words)