The Church is called a kingdom: “He shall reign over the house of Jacob forever, and of His kingdom there shall be no end.”(20) Now in every well-regulated kingdom there is but _one king, one form of government, one uniform body of laws_, which all are obliged to observe. In like manner, in Christ’s spiritual kingdom, there must be one Chief to whom all owe spiritual allegiance; one form of ecclesiastical government; one uniform body of laws which all Christians are bound to observe; for, “every kingdom divided against itself shall be made desolate.”(21) Our Savior calls His Church a sheepfold. “And there shall be made one fold and one shepherd.”(22) What more beautiful or fitting illustration of unity can we have than that which is suggested by a sheepfold? All the sheep of a flock cling together. If they are momentarily separated, they are impatient till reunited. They follow in the same path. They feed on the same pastures. They obey the same shepherd, and fly from the voice of strangers. So did our Lord intend that all the sheep of His fold should be nourished by the same sacraments and the same bread of life; that they should follow the same rule of faith as their guide to heaven; that they should listen to the voice of one Chief Pastor, and that they should carefully shun false teachers. His Church is compared to a human body. “As in one body we have many members, but all the members have not the same office; so we, being many, are one body in Christ, and every one members one of the other.”(23) In one body there are many members, all inseparably connected with the head. The head commands and the foot instantly moves, the hand is raised and the lips open. Even so our Lord ordained that His Church, composed of many members, should be all united to one supreme visible Head, whom they are bound to obey. The Church is compared to a vine. “I am the Vine, ye the branches; he that abideth in Me and I in him, the same beareth much fruit, for without Me ye can do nothing.”(24) All the branches of a vine, though spreading far and wide, are necessarily connected with the main stem, and from its sap they are nourished. In like manner, our Saviour will have all the saplings of His Vineyard connected with the main stem, and all draw their nourishment from the parent stock. The Church, in fine, is called in Scripture by the beautiful title of bride or spouse of Christ,(25) and the Christian law admits only of one wife.