Whatever of truth there may be in the charge of "other-worldliness," as brought against the modern exponents of Christianity, such a charge could not even be whispered against its Divine Founder. It is just possible that the Church had been gazing too steadfastly up into heaven, and that she had not been studying the science of the "Humanities" as zealously as she ought, and as she has done since; but Jesus did not allow even heavenly things to obliterate or to blur the lines of earthly duty. We might have supposed that coming down from heaven, and familiar with its secrets, He would have much to say about the New World, its position in space, its society and manner of life. But no; Jesus says little about the life which is to come; it is the life which now is that engrosses His attention, and almost monopolizes His speech. Life with Him was not in the future tense; it was one living present, real, earnest, but fugitive. Indeed, that future was but the present projected over into eternity. And so Jesus, founding the kingdom of God on earth, and summoning all men into it, if he did not bring commandments written and lithographed, like Moses, yet He did lay down principles and rules of conduct, marking out, in all departments of human life, the straight and white lines of duty, the eternal "ought." It is true that Jesus Himself did not originate much in this department of Christian ethics, and probably for most of His sayings we can find a symphony struck from the pages of earlier, and perhaps heathen moralists; but in the wide realm of Right there can be no new law. Principles may be evolved, interpreted; they cannot be created. Right, like Truth, holds the "eternal years;" and through the millenniums before Christ, as through the millenniums after, Conscience, that "ethical intellect" which speaks to all men if they will but draw near to her Sinai and listen, spoke to some in clear, authoritative tones. But if Jesus did no more, He gathered up the "broken lights" of earth, the intermittent flashes which had played on the horizon before, into one steady electric beam, which lights up our human life outward to its farthest reach, and onward to its farthest goal.
In the mind of Jesus conduct was the outward and visible expression of some inner invisible force. As our earth moves round its elliptic in obedience to the subtle attractions of other outlying worlds, so the orbits of human lives, whether symmetrical or eccentric, are determined mainly by the two forces' Character and Circumstance. Conduct is character in motion; for men do what they themselves are, _i.e._ as far as circumstances will allow. And it is just at this point the ethical teaching of Jesus begins. He recognizes the _imperium in imperio_, that hidden world of thought, feeling, sentiment, and desire which, itself invisible, is the mould in which things visible are cast. And so Jesus, in His influence upon men, worked outward from within. He sought, not reform, but regeneration, moulding the life by changing the character; for, to use His own figure, how could the thorn produce grapes, or the thistle figs?
And so when Jesus was asked, "What shall I do that I may inherit eternal life?" He gave an answer which at first sight seemed to ignore the question entirely. He said no word about "doing," but threw the questioner back upon "being," asking what was written in the law: "Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy strength, and with all thy mind; and thy neighbour as thyself" (x. 27). And as Jesus here makes Love the condition of eternal life, its _sine qua non_, so He makes it the one all-embracing duty, the fulfilling of the law. If a man love God supremely, and his neighbour as himself, he cannot do more; for all other commandments are included in these, the sub-sections of the greater law. Jesus thus sought to create a new force, hiding it within the heart, as the mainspring of duty, providing for that duty both aim and inspiration. We call it a "new" force, and such it was practically; for though it was, in a way, embedded in their law, it was mainly as a dead letter, so much so that when Jesus bade His disciples to "love one another" He called it a "new commandment." Here, then, we find what is at once the rule of conduct and its motive. In the new system of ethics, as taught and enforced by Jesus, and illustrated by His life, the Law of Love was to be supreme. It was to be to the moral world what gravitation is to the natural, a silent but mighty and all-pervasive force, throwing its spell upon the isolated actions of the common day, giving impulse and direction to the whole current of life, ruling alike the little eddies of thought and the wider sweeps of benevolent activities. To Jesus "the soul of improvement was the improvement of the soul." He laid His hand upon the heart's innermost shrine, building up that unseen temple four-square, like the city of the Apocalypse, and lighting up all its windows with the warm, iridescent light of love.