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

The Same Truth That Saves Also Hardens

"I shall end this postscript with observing, that when the popular preachers can find no other way of showing their contempt of the simple belief of the truth, as the sole requisite to justification, they call it the faith of devils. Yet, however keen the intended reproach be, it can have weight with none but those who are swayed by sound instead of sense. For, according to the Scripture, the same truth which saves Christ's people, torments the devils. So we find them saying, 'what have we to do with thee, Jesus, thou Son of God? Art thou come hither to torment us before the time?' They believe, they hate, and yet they tremble at that truth which Christ's people believe, love, and find salvation in." - Robert Sandeman, Theron And Aspasio, Pg. 346

There is a distinction between Christ's people and the world

"The true profession of Christ's truth, and all his commands and institutions, will always, one way or other, cross our worldly interest: 'For all that will live godly in him, must suffer.' And it is a vain thing to think to hold him and our worldly interest together: 'No man can serve two masters,' 2 Tim 3. 12, Rev 12.17." -John Glas, King of Martyrs, In The works of John Glas, pg. 94