What is this questioning nothing holds away, nothing stills, and nothing wears out? It is the voice of God Himself, and its insistence is therefore as irresistible as its effect is universal. That is not mere rhetoric which opens the Lord's controversy: _Hear, O heavens, and give ear, O earth, for the Lord hath spoken_. All the world changes to the man in whom conscience lifts up her voice, and to the guilty Nature seems attentive and aware. Conscience compels heaven and earth to act as her assessors, because she is the voice, and they the creatures, of God. This leads us to emphasize another feature of the prophecy. We have called this chapter a trial-at-law; but it is far more a _personal_ than a legal controversy; of the formally forensic there is very little about it. Some theologies and many preachers have attempted the conviction of the human conscience by the technicalities of a system of law, or by appealing to this or that historical covenant, or by the obligations of an intricate and burdensome morality. This is not Isaiah's way. His generation is here judged by no system of law or ancient covenants, but by a living Person and by His treatment of them--a Person who is a Friend and a Father. It is not Judah and the law that are confronted; it is Judah and Jehovah. There is no contrast between the life of this generation and some glorious estate from which they or their forefathers have fallen; but they are made to hear the voice of a living and present God: _I have nourished and brought up children, and they have rebelled against Me_. Isaiah begins where Saul of Tarsus began, who, though he afterwards elaborated with wealth of detail the awful indictment of the abstract law against man, had never been able to do so but for that first confronting with the Personal Deity, _Saul, Saul, why persecutest thou Me?_ Isaiah's ministry started from the vision of the Lord; and it was no covenant or theory, but the Lord Himself, who remained the prophet's conscience to the end.