_These Ideas of internal Origin, in what Sense._--It has been customary of late, especially in our country, to speak of the class of ideas now referred to as of _internal origin_, in distinction from other ideas, derived more directly from sense, and which are consequently designated as of external origin. As it is desirable to be exact in our use of terms, it may be well to inquire in what sense any of our ideas are of external, and in what sense of internal origin, and wherein the ideas, now under consideration, differ from any others in respect to their source. _Ideas of external Origin._--A large class of our ideas evidently relate to objects of sense, objects external and material, of which we take cognizance through the senses. Such ideas may be said to be of external origin, inasmuch as they relate to things without, and are dependent on the external object as the indispensable condition of their development. Were it not for the external object producing the sensation of color or of hardness, I should not have the idea of redness or of hardness; were it not for the external object resisting my movements, I should not get the idea of externality. The idea is, in these cases, dependent on, and limited by, the sensation or the perception. They correspond as shadow and substance. The idea of resistance, and the perception of it, the idea of sound or color, and the sensation of it, are coëxtensive, synchronous, and, as to contents, identical. _These, in a Sense, internal._--In another sense, however, even these ideas are of internal origin, that is, they are the mind's own ideas; they spring up in the mind, and not out of it; they are, as ideas, strictly internal states, affections, acts of the mind itself. Take away intelligence, reason, the light divine, from the soul of man, and the external objects may exist as before, and produce the same effect on the organs of sense, but the ideas no longer follow. The physical organs of the idiot are affected in the same way by external objects as those of any other person, but he gets not the same ideas. These, it is the office of the mind to produce and fashion for itself out of the occasion and material furnished by sense. And this is as true of ideas relating to external objects as to any other.