In considering the words of Jesus, if we may not be able to measure their depth or to scale their height, we can with absolute certainty discover their drift, and see in what direction they move, and we shall find that their orbit is an ellipse. Moving around the two centres, sin and salvation, they describe what is not a geometric figure, but a glorious reality, "the kingdom of God." It is not unlikely that the expression was one of the current phrases of the times, a golden casket, holding within it the dream of a restored Hebraism; for we find, without any collusion or rehearsal of parts, the Baptist making use of the identical words in his inaugural address, while it is certain the disciples themselves so misunderstood the thought of their Master as to refer His "kingdom" to that narrow realm of Hebrew sympathies and hopes. Nor did they see their error until, in the light of Pentecostal flames, their own dream disappeared, and the new kingdom, opening out like a receding sky, embraced a world within its folds. That Jesus adopted the phrase, liable to misconstruction as it was, and that He used it so repeatedly, making it the centre of so many parables and discourses, shows how completely the kingdom of God possessed both His mind and heart. Indeed, so accustomed were His thoughts and words to flow in this direction that even the valley of Death, "lying darkly between" His two lives, could not alter their course, or turn His thoughts out of their familiar channel; and as we find the Christ beyond the cross and tomb, amid the resurrection glories, we hear Him speaking still of "the things pertaining to the kingdom of God."
It will be observed that Jesus uses the two expressions "the kingdom of God" and "the kingdom of heaven" interchangeably. But in what sense is it the "kingdom of heaven"? Does it mean that the celestial realm will so far extend its bounds as to embrace our outlying and low-lying world? Not exactly, for the conditions of the two realms are so diverse. The one is the perfected, the visible kingdom, where the throne is set, and the King Himself is manifest, its citizens, angels, heavenly intelligences, and saints now freed from the cumbering clay of mortality, and for ever safe from the solicitations of evil. This New Jerusalem does not come down to earth, except in the vision of the seer, as it were in a shadow. And yet the two kingdoms are in close correspondence, after all; for what is the kingdom of God in heaven but His eternal rule over the spirits of the redeemed and of the unredeemed? what are the harmonies of heaven but the harmonies of surrendered wills, as, without any hesitation or discord, they strike in with the Divine Will in absolute precision? To this extent, then, at least, heaven may project itself upon earth; the spirits of men not yet made perfect may be in subjection to the Supreme Spirit; the separate wills of a redeemed humanity, striking in with the Divine Will, may swell the heavenly harmonies with their earthly music.
And so Jesus speaks of this kingdom as being "within you." As if He said, "You are looking in the wrong direction. You expect the kingdom of God to be set up around you, with its visible symbols of flags and coins, on which is the image of some new Cæsar. You are mistaken. The kingdom, like its King, is unseen; it seeks, not countries, but consciences; its realm is in the heart, in the great interior of the soul." And is not this the reason why it is called, with such emphatic repetition, "_the_ kingdom," as if it were, if not the only, at any rate the highest kingdom of God on earth? We speak of a kingdom of Nature, and who will know its secrets as He who was both Nature's child and Nature's Lord? And how far-reaching a realm is that! from the motes that swim in the air to the most distant stars, which themselves are but the gateway to the unseen Beyond! What forces are here, forces of chemical affinities and repulsions, of gravitation and of life! What successions and transformations can Nature show! what infinite varieties of substance, form, and colour! what a realm of harmony and peace, with no irruptions of discordant elements! Surely one would think, if God has a kingdom upon earth, this kingdom of Nature is it. But no; Jesus does not often refer to that, except as He makes Nature speak in His parables, or as He uses the sparrows, the grass, and the lilies as so many lenses through which our weak human vision may see God. The kingdom of God on earth is as much higher than the kingdom of Nature as spirit is above matter, as love is more and greater than power.