The writings of the prophets are very difficult, and their period is less popularly known than any other period of Scripture history, either before or after it. But it is beginning to attract more attention, and in the near future it will do so much more, because it is beginning to be perceived that in it lies the key to the whole Old Testament history and literature.[3] The writings of Isaiah especially have of late attracted attention. Commentary after commentary on them has appeared;[4] till now the reader can see his way pretty clearly through the tangled but enchanting mazes of his writings. With such helps as have been available to me I have endeavoured through the writings to get at the man; and I will take Isaiah as the representative of the prophetic spirit in the same way as St. Paul is to represent for us the apostles. But here again my aim is neither that of the commentator nor that of the biographer. It is the soul of the man I wish to depict and the spirit of his work. It may be thought that, by taking up the subject in this way, I am missing the opportunity of dealing with the practical work of to-day. But I do not think so. There are, indeed, some details nearly always discussed in lectures on preaching which I do not care to touch. There is, for instance, the question of the delivery of sermons--whether the preacher should read, or speak _memoriter_, or preach _extempore_. This can be discussed endlessly, and the discussion is always interesting; but, if it were discussed every year for a century, it would be as far from being settled as ever. Besides, it is my duty to remember what others have handled exhaustively here before me. Indeed, the Senate mentioned to me that it was desirable that the subject should be taken up from a new point of view. They have been good enough to express their approbation of the way in which I mean to treat it; but it is not in deference to their instructions that I take it up in this way, but in accordance with the bent of my own mind; and I think I see my way to bring to bear on it all the practical experience which I may be in possession of; for I quite recognise that the value of such a course of lectures largely depends on its being, from beginning to end, what in literature is called a Confession, that is, a record of experiences. Although I am to go back to the ages of the apostles and the prophets, I do not intend to stay there. My wish is to bring down from thence fire which will kindle your hearts, as you face the world and the tasks of to-day.