Chapter XVI · THE DISTINCTION BETWEEN THE INTELLECTUAL AND ACTIVE POWERS OF THE HUMAN MIND.

“It is the greatest triumph of philosophy to refer many, and seemingly very various, phenomena, to one, or a very few, simple principles: and the more simple and evident such a principle is, provided it be truly applicable to all the cases in question, the greater is its value and scientific beauty.”—Elements of Logic, by Dr. Whately, p. 32.

THE Phenomena of Thought have long appeared to be divisible into two great classes; which were distinguished by the names, the one of the Intellectual, the other of the Active, Powers of the Human Mind. In the phenomena which compose the first of those classes, and which we have now pretty completely surveyed, the sensations and ideas are considered merely as existing. In the phenomena which compose the second of the two classes, the sensations and ideas are to be considered as not merely existing, but also as exciting to action.35

With respect to the sensations and ideas which compose the phenomena of the first class, we have observed, that they are apt to be formed into clusters of more or less complexity; and that they follow one another, in trains, according to certain laws.

The sensations and ideas, which compose the phenomena of the second class, are equally formed into clusters, with those composing the phenomena of the former class; and follow one another, in trains, according to the same laws.

So far, the two classes of phenomena agree; and so far, the analysis, which we have endeavoured to effect of the former class, is to be taken as the analysis also of the latter. Our object, now, is, to trace to their source the differences which constitute this a separate class; to mark the subdivisions into which it can be most conveniently distributed; and to demonstrate the simple laws, into which the whole phenomena of human life, so numerous, and apparently so diversified, may all be easily resolved.