When God has a great work to do in his kingdom on earth he trains and associates congenial agents of different .gifts, but of one spirit and aim, to carry out his purposes. They supplement and encourage one another and accomplish much more in unison than they could in isolation. Moses and Aaron, David and Jonathan, in the history of Israel; Paul and Barnabas, Peter and Mark, in apostolic times; Pamphilius and Eusebius, Basil and Gregory Nazianzen, among the fathers; Luther and Melanchthon, Zwingli, Occolampadius and Bullinger, Calvin, Farel, Viret, and Beza, Cranmer, Latimer and Ridley, among the Reformers; the two Wesleys and Whitefield in the Methodist revival; Pusey, Newman and Keble in the Anglo-Catholic movement of our days, will readily occur to the memory as illustrious examples of co-operative friendship for the advancement of God's kingdom.