Astonished at their own silent and obscure progress, some have imagined that they have formed their genius solely by their own studies; when they generated, they conceived that they had acquired; and, losing the distinction between nature and habit, with fatal temerity the idolatry of philosophy substituted something visible and palpable, yet shaped by the most opposite fancies, called a Theory, for Nature herself! Men of genius, whose great occupation is to be conversant with the inspirations of Nature, made up a factitious one among themselves, and assumed that they could operate without the intervention of the occult original. But Nature would not be mocked; and whenever this race of idolaters have worked without her agency, she has afflicted them with the most stubborn sterility. Theories of genius are the peculiar constructions of our own philosophical times; ages of genius had passed away, and they left no other record than their works; no preconcerted theory described the workings of the imagination to be without imagination, nor did they venture to teach how to invent invention. The character of genius, viewed as the effect of habit and education, on the principle of the equality of the human mind, infers that men have an equal aptitude for the work of genius: a paradox which, with a more fatal one, came from the French school, and arose probably from an equivocal expression. Locke employed the well-known comparison of the mind with "white paper void of all characters," to free his famous "Inquiry" from that powerful obstacle to his system, the absurd belief of "innate ideas," of notions of objects before objects were presented to observation. Our philosopher considered that this simple analogy sufficiently described the manner in which he conceived the impressions of the senses write themselves on the mind. His French pupils, the amusing Helvetius, or Diderot, for they were equally concerned in the paradoxical "L'Esprit," inferred that this blank paper served also as an evidence that men had _an equal aptitude for genius_, just as the blank paper reflects to us whatever characters we trace on it. This _equality of minds_ gave rise to the same monstrous doctrine in the science of metaphysics which that of another verbal misconception, _the equality of men_, did in that of politics. The Scottish metaphysicians powerfully combined to illustrate the mechanism of the mind,--an important and a curious truth; for as rules and principles exist in the nature of things, and when discovered are only thence drawn out, genius unconsciously conducts itself by a uniform process; and when this process had been traced, they inferred that what was done by some men, under the influence of fundamental laws which regulate the march of the intellect, must also be in the reach of others, who, in the same circumstances, apply themselves to the same study. But these metaphysicians resemble anatomists, under whose knife all men are alike.