But how did they get this knowledge? They do not describe any special means by which it came to them. They state this high and novel truth simply as the last step in a process of their consciousness. At first they were bewildered by the Servant's suffering; then they thought it contemptible, thus passing upon it an intellectual judgement; then, forced to seek a moral reason for it, they accounted it as penal and due to the Servant for his own sins; then they recognised that its penalty was vicarious, that the Servant was suffering for them; and finally, they knew that it was redemptive, the means of their own healing and peace. This is a natural climax, a logical and moral progress of thought. The last two steps are stated simply as facts of experience following on other facts. Now our prophet usually publishes the truths, with which he is charged, as the very words of God, introducing them with a solemn and authoritative _Thus saith Jehovah._ But this novel and supreme truth of vicarious and redemptive suffering, this passion and virtue which crowns the Servant's office, is introduced to us, not by the mouth of God, but by the lips of penitent men; not as an oracle, but as a confession; not as the commission of Divine authority laid beforehand upon the Servant like his other duties, but as the conviction of the human conscience after the Servant has been lifted up before it. In short, by this unusual turn of his art, the prophet seeks to teach us, that vicarious suffering is not a dogmatic, but an experimental truth. The substitution of the Servant for the guilty people, and the redemptive force of that substitution, are no arbitrary doctrine, for which God requires from man a mere intellectual assent; they are no such formal institution of religion as mental indolence and superstition delight to have prepared for their mechanical adherence: but substitutive suffering is a great living fact of human experience, whose outward features are not more evident to men's eyes than its inner meaning is appreciable by their conscience, and of irresistible effect upon their whole moral nature.