The world cannot be Christ's Kingdom

"A society avouching Christ to be head and king of it, furnished with worldly power for defending his truths and institutions, and associated for defending his interest, and their profession of subjection to him, by the sword, is undoubtedly a kingdom of this world, by our Lord's description of a kingdom of this world: for it agrees with our Lord's account of such a kingdom, in that whereby it is distinguished from his kingdom. Let it be what it will then, his kingdom it is not. And such association is plainly cross to this testimony of our Lord concerning his kingdom." - John Glas, King of Martyrs, The Works of John Glas, pg. 97