In the action of pain and pleasure, it seems to be an obvious fact that pain, as pain, represents tension, that is, a state of feeling from which there is a tendency to change; pleasure represents equilibrium, or a state in which there is a tendency to persist. The worm writhes on the hook, and the mind may be said to writhe under a painful emotion in the effort to writhe into some more tolerable position. In the act of choice, each mode of action is tried ideally, and the individual settles into that which is, on the whole, the easiest. The analogy which naturally offers itself and seems to give the best account of the facts is the mechanical principle of least resistance. It is not, perhaps, superfluous to remark that the volition may exercise a very small influence, even when the limiting conditions are in a great part ideal. The more painful is not necessarily the less permanent condition. It is one in which there is an additional chance against permanence. Terror sets up so disturbed a condition that the mind cannot settle into any definite course. We can no more alter arbitrarily the circumstances of our microcosm than those of the external world. It is as difficult to avoid brooding in vain regret as to evade a physical constraint. Reason and feeling are bound together in inseparable unity. But reason, whatever its nature, is the faculty which enables us to act with a view to the distant and the future. A great part of conduct is automatic; it is either not determined by conscious motives, or it is determined by motives which, though they rise for a moment to the surface of consciousness, are forgotten as soon as felt. Of our conscious conduct, again, part may be called instinctive and part reasonable. These modes of action pass into each other by imperceptible degrees. The instinctive may be converted into reasoned as the consequences become manifest, and the reasoned become instinctive as the consequences are left out of account. So, again, the instinctive action becomes automatic when it is performed without leaving any trace upon consciousness. It may still be voluntary in the sense that the agent may be able to refrain from it if his attention happens to be aroused. Habitual actions pass through all these gradations. When the reason is called into action, it is not in virtue of a purely logical operation that it conquers if it does so; it is in virtue of the fact that it reveals a new set of forces ready to spring into action to the necessary degree. We may be said to feel by signs as well as to reason by signs. The sight of a red flag may deter us from crossing a rifle range without calling up to our imagination all the effects of a bullet traversing the body. If the motive which prompts us to run the risk be strong, it may be necessary to convert a greater volume of latent, into active emotion; and as we frequently fail to do this, we often run risks which we should avoid were the consequences distinctly contemplated.