III. Introspection finds another great class of conditions in experience, again on the receptive side--conditions which convert the mind from the mere theatre of indifferent changes into the vitally interested, warmly intimate thing which our mental life is to each of us. This is the sphere of Feeling. We may see without more ado that while we are receiving sensations and thoughts and suggestions, and acting upon them in the variety of ways already pointed out, we ourselves are not indifferent spectators of this play, this come-and-go of processes. We are directly implicated; indeed, the very sense of a self, an ego, a me-and-mine, in each consciousness, arises from the fact that all this come-and-go is a personal growth. The mind is not a mere machine doing what the laws of its action prescribe. We find that nothing happens which does not affect the mind itself for better or for worse, for richer or for poorer, for pleasure or for pain; and there spring up a series of attitudes of the mind itself, according as it is experiencing or expecting to experience what to it is good or bad. This is, then, the great meaning of Feeling; it is the sense in the mind that it is itself in some way influenced for good or for ill by what goes on within it. It stands midway between thought and action. We feel with reference to what we think, and we act because we feel. All action is guided by feeling. Feeling shows two well-marked characters: first, the Excitement of taking a positive attitude; and, second, the Pleasure or Pain that goes with it. Here, again, it may suffice to distinguish the stages which arise as we go from the higher to the lower, from the life of Sensation and Perception up to that of Thought. This was our method in both of the other phases of the mental life--Knowledge and Action. Doing this, therefore, in the case of Feeling also, we find different terms applied to the different phases of feeling. In the lowest sort of mental life, as we may suppose the helpless newborn child to have it, and as we also think it exists in certain low forms of animal life, feeling is not much more than Pleasures and Pains depending largely upon the physical conditions under which life proceeds. It is likely that there are both Pleasures and Pains which are actually sensations with special nerve apparatus of their own; and there are also states of the Comfortable and the Uncomfortable, or of pleasant and unpleasant feeling, due to the way the mind is immediately affected. These are conditions of Excitement added to the Sensations of Pleasure and Pain.