Isaiah's sin being taken away, he is able to discern the voice of God Himself. It is in the most beautiful accordance with what has already happened that he hears this not as command, but request, and answers not of compulsion, but of freedom. _And I heard the voice of the Lord saying, Whom shall I send? and who will go for us? And I said, Here am I; send me._ What spiritual understanding alike of the will of God and the responsibility of man, what evangelic liberty and boldness, are here! Here we touch the spring of that high flight Isaiah takes both in prophecy and in active service for the State. Here we have the secret of the filial freedom, the life-long sense of responsibility, the regal power of initiative, the sustained and unfaltering career, which distinguish Isaiah among the ministers of the old covenant, and stamp him prophet by the heart and for the life, as many of them are only by the office and for the occasion. Other prophets are the servants of the God of heaven; Isaiah stands next the Son Himself. On others the hand of the Lord is laid in irresistible compulsion; the greatest of them are often ignorant, by turns headstrong and craven, deserving correction, and generally in need of supplementary calls and inspirations. But of such scourges and such doles Isaiah's royal career is absolutely without a trace. His course, begun in freedom, is pursued without hesitation or anxiety; begun in utter self-sacrifice, it knows henceforth no moment of grudging or disobedience. _Esaias is very bold_, because he is so free and so fully devoted. In the presence of mind with which he meets each sudden change of politics during that bewildering half-century of Judah's history, we seem to hear his calm voice repeating its first, _Here am I_. Presence of mind he always had. The kaleidoscope shifts: it is now Egyptian intrigue, now Assyrian force; now a false king requiring threat of displacement by God's own hero, now a true king, but helpless and in need of consolation; now a rebellious people to be condemned, and now an oppressed and penitent one to be encouraged:--different dangers, with different sorts of salvation possible, obliging the prophet to promise different futures, and to say things inconsistent with what he had already said. Yet Isaiah never hesitates; he can always say, _Here am I_. We hear that voice again in the spontaneousness and versatility of his style. Isaiah is one of the great kings of literature, with every variety of style under his sway, passing with perfect readiness, as subject or occasion calls, from one to another of the tones of a superbly endowed nature. Everywhere this man impresses us with his personality, with the wealth of his nature and the perfection of his control of it. But the personality is consecrated. The _Here am I_ is followed by the _send me_. And its health, harmony and boldness, are derived, Isaiah being his own witness, from this early sense of pardon and purification at the Divine hands. Isaiah is indeed a king and a priest unto God--a king with all his powers at his own command, a priest with them all consecrated to the service of Heaven.