The orator who would do justice to a great theme or a great occasion must thoroughly study and understand the subject; he must accurately, and if possible minutely, digest in writing beforehand the substance, and even the form, of his address; otherwise, though he may speak ably, he will be apt not to make in all respects an able speech. He must entirely possess himself beforehand of the main things which he wishes to say, and then throw himself upon the excitement of the moment and the sympathy of the audience. In those portions of his discourse which are didactic or narrative, he will not be likely to wander, in any direction, far from his notes; although even in those portions new facts, illustrations, and suggestions will be apt to spring up before him as he proceeds. But when the topic rises, when the mind kindles from within, and the strain becomes loftier, or bolder, or more pathetic, when the sacred fountain of tears is ready to overflow, and audience and speaker are moved by one kindred sympathetic passion, then the thick-coming fancies cannot be kept down, the storehouse of the memory is unlocked, images start up from the slumber of years, and all that the orator has seen, read, heard, or felt returns in distinct shape and vivid colors. The cold and premeditated text will no longer suffice for the glowing thought. The stately, balanced phrase gives place to some abrupt, graphic expression, that rushes unbidden to his lips. The unforeseen incident or locality furnishes an apt and speaking image; and the discourse instinctively transposes itself into a higher key.