Why is this? At first view, philosophy would account for it on the ground of vices natural to us--pride, the spirit of domination, self-love, the wickedness of mankind. It would perhaps add, that the sense of his own weakness makes the child eager to do things requiring strength, and so prove to himself his own power. But see that old man, infirm and broken down, whom the cycle of human life brings back to the weakness of childhood. Not only does he remain immovable and quiet, but he wishes everything about him to be in the same condition. The slightest change disturbs and disquiets him; he would like to see stillness reigning everywhere. How could the same powerlessness, joined to the same passions, produce such different effects in the two ages, if the primary cause were not changed? And where can we seek for this difference of cause, unless it be in the physical condition of the two individuals? The active principle common to the two is developing in the one, and dying out in the other; the one is growing, and the other is wearing itself out; the one is tending toward life, and the other toward death. Failing activity concentrates itself in the heart of the old man; in the child it is superabounding, and reaches outward; he seems to feel within him life enough to animate all that surrounds him. Whether he makes or unmakes matters little to him. It is enough that he changes the condition of things, and that every change is an action. If he seems more inclined to destroy things, it is not out of perverseness, but because the action which creates is always slow; and that which destroys, being more rapid, better suits his natural sprightliness. While the Author of nature gives children this active principle, he takes care that it shall do little harm; for he leaves them little power to indulge it. But no sooner do they look upon those about them as instruments which it is their business to set in motion, than they make use of them in following their own inclinations and in making up for their own want of strength. In this way they become disagreeable, tyrannical, imperious, perverse, unruly; a development not arising from a natural spirit of domination, but creating such a spirit. For no very long experience is requisite in teaching how pleasant it is to act through others, and to need only move one's tongue to set the world in motion. As we grow up, we gain strength, we become less uneasy and restless, we shut ourselves more within ourselves. The soul and the body put themselves in equilibrium, as it were, and nature requires no more motion than is necessary for out preservation. But the wish to command outlives the necessity from which, it sprang; power to control others awakens and gratifies self-love, and habit makes it strong. Thus need gives place to whim; thus do prejudices and opinions first root themselves within us.