become puzzled about the _principium individuationis_, because the principle of sufficient reason in some one of its forms seems to admit of an exception. For example, if it seems as if some change took place without a cause, or some one who is dead appears again, or if in any other way the past or the future becomes present or the distant becomes near. The fearful terror at anything of the kind is founded on the fact that they suddenly become puzzled about the forms of knowledge of the phenomenon, which alone separate their own individuality from the rest of the world. But even this separation lies only in the phenomenon, and not in the thing-in-itself; and on this rests eternal justice. In fact, all temporal happiness stands, and all prudence proceeds, upon ground that is undermined. They defend the person from accidents and supply its pleasures; but the person is merely phenomenon, and its difference from other individuals, and exemption from the sufferings which they endure, rests merely in the form of the phenomenon, the _principium individuationis_. According to the true nature of things, every one has all the suffering of the world as his own, and indeed has to regard all merely possible suffering as for him actual, so long as he is the fixed will to live, _i.e._, asserts life with all his power. For the knowledge that sees through the _principium individuationis_, a happy life in time, the gift of chance or won by prudence, amid the sorrows of innumerable others, is only the dream of a beggar in which he is a king, but from which he must awake and learn from experience that only a fleeting illusion had separated him from the suffering of his life.