I. Consider the nature of Christ's kingdom, "My kingdom is not of this world." It is spiritual. In other words, the emphatic mark of the rule of Christ which He was about to set up seems to be that of its perfect spirituality, of its utter unlikeness to those shifting earthly sovereignties which are founded in arms, which are maintained by policy, which are passed by death from one hand to another; or to that rude and turbulent anarchy which has often cast down and destroyed nations. He goes on to say, "If My kingdom were of this world, then would My servants fight." The points at issue between us would have to be decided by the broad tests of earthly warfare, strength measured against strength, and skill against skill, till one of the opposing forces should give way. But, as we see throughout our Lord's ministrations, He never would employ force at all. From the first, the Saviour was careful to impress on all who should come after Him that the weapons of the Christian warfare are not carnal, that the wrath of man could never work the righteousness of God, and that, when undertaking any work for Him, if we could not accomplish it by the power of loving suasion, gentleness and meekness, we should never accomplish it in any other way.
II. Consider how Christ establishes and maintains His dominion in our own hearts: (1) The means by which His subjects are brought into the kingdom are not of this world. He uses no force, employs no bribes, has recourse to no deceit or guile. The agency which works in the heart is the power of love; the hidden strength of Gospel bonds; the remnants of a better nature appealed to to say whether such a Saviour should be slighted by anybody with a heart at all. (2) There are laws and statutes by which the spiritual government is carried on. These are not like those which belong to a kingdom of this world, not like them in regard to the seat and limits of their jurisdiction. The empire of Christ is over the heart, and is satisfied with nothing but the casting down of heart-pride, and the rooting out of heart-sin, and the maintaining in all its subjects of heart-allegiance and duty. (3) The chastisements and the rewards of Christ's kingdom are not of the world. The attribute of spirituality marks all His dealings. Not of this world is our kingdom, not of this world is our hope. We look for a kingdom which shall not be moved, and whose King is both the first-begotten from the dead and the Prince of the kings of the earth.
D. Moore, Penny Pulpit,No. 3122.
References: John 18:36. A. Mursell, Christian World Pulpit,vol. iv., p. 225; E. de Pressensé, Ibid.,vol. xvi., p. 122; Homiletic Magazine,vol. xii., p. 193; Parker, Cavendish Pulpit,vol. ii., p. 205; S. A. Brooke, Sermons,p. 180; J. H. Evans, Thursday Penny Pulpit,vol. xv., pp. 249, 261, 273, 285; D. Swing, American Pulpit of the Day,p. 241. Joh 18:36-38. Homilist,3rd series, vol. i., p. 206.