Furthermore, there are in human minds varieties of power of an astonishing description: although there be faculties common to all men, the vigour of those faculties in some cases is such as perfectly to eclipse the vigour of them in others. The superiority of individual minds, whose works have filled the world with wonder, is such as to leave behind, at an unapproachable distance, the ordinary measure of human endowment. Certain intellects (I need not name them) have long exercised a formative power upon the civilized portions of our race. They have been as crystals inserted in a solution, and other crystals have received shape from them. Whence have come these typical energies in the intellectual world? No law of development will account for a resplendent genius now and then flashing on the world; for the appearance of a master mind, after humanity has kept on a low level through generation after generation; for the ascent again of gifted spirits into the highest heaven of invention, after another lapse into mere mediocrity. No known laws of causality account for such facts in the realms of intellectual existence. If, in the case of man, as compared with other animals, the difference, as Aristotle says, is something which comes _from without_, the same may be said with respect to the difference between ordinary mortals and William Shakespere or John Milton. There is forced upon us the conviction, that these stars which dwell apart are kindled by fires burning in superhuman spheres. I do not say, in this case, any more than in the others I have cited, that we find an exact parallel to a miracle; but I do maintain, that we discover here a kind of inspiration which, like the miraculous, transcends all known laws, and brings to mind what was said by the first of those just named: "There are more things in heaven and earth, Horatio, Than are dreamt of in your philosophy."