In his Lyman Beecher Lectures at Yale University in 1877, Phillips Brooks defined preaching this way:
Preaching is the communication of truth by man to men. It has in it two essential elements, truth and personality. Neither of those can it spare and still be preaching. The truest truth, the most authoritative statement of God’s will, communicated in any other way than through the personality of brother man to men is not preached truth. Suppose it written on the sky, suppose it embodied in a book which has been so long held in reverence as the direct utterance of God that that the vivid personality of the men who wrote its pages has well-nigh faded out of it; in neither of these cases is there any preaching. And on the other hand, if men speak to other men that which they do not claim for truth, if they use their powers of persuasion or of entertainment to make other men listen to their speculations, or do their will, or applaud their cleverness, that is not preaching either. The first lacks personality. The second lacks truth. And preaching is the bringing of truth through personality. It must have both elements (“Truth and Personality” in The Company of Preachers, edited by Richard Lischer [Grand Rapids: Eerdmans, 2002], 16).