Part III. closes (Chapter IX.) with an inquiry into the Ethical Difference of Character. The theory that this difference is innate and immutable is supported by numerous extracts from various writers of all periods, and illustrated in many ways. But all the evidence accumulated hardly amounts to more than so many hints and indications, and the matter (says Schopenhauer) was only satisfactorily explained by Kant's doctrine of the Intelligible and Empirical Character. (Cf. Part II., Chapter VIII.) According to this, the ethical difference between man and man is an original and ultimate datum, caused by the transcendentally free act of the Intelligible Character, that is, the Will, as Thing in itself, outside phaenomena; the Empirical Character being, so to say, the reflection of the Intelligible, mirrored through the functions of our perceptive faculty, namely, Time, Space, and Causality. Hence the former, while manifested in plurality and difference of acts, yet necessarily always wears the same unchangeable features, inasmuch as it is but the appearance-form of the unity behind. If the reader asks why "the essential constitution of the Thing in itself underlying the phaenomenon" is so enormously different in different individuals, it can only be said that our intellect, conditioned, as it is, by the laws of Causality, Space, and Time, has no power to deal with noumena, its range being limited to phaenomena; and that therefore this question is one of those which have no conceivable answer. (Cf. _Die Welt als Wille und Vorstellung_, vol. ii., chap. 50., Epiphilosophie.)[7] The discussion now terminated points to the conclusion that nine-tenths, or perhaps nineteen-twentieths, of what we do is, more or less, due to Egoism, conscious or unconscious; while acts of real morality, that is, of unselfish justice and pure loving-kindness (admitting that they occur) are to be attributed to Compassion, that is, the sense of =suffering with= another. Nor is the principle of Altruism new. It is as old as man himself. All the rare and sensitive natures in the world have given utterance to it, each in his own way. Like a golden thread it runs from the earliest Indian literature to George Eliot, to Tolstoï; and every day, for unnumbered ages, "from youth to eld, from sire to son," in lowly dwellings and in princes' palaces, it has been unawares translated into action. And if we may forecast the future from the past, it would appear that in all the stormy seas yet to be traversed by the human race, before its little day is spent, Compassion will ever be the surest guide to better things; and that the light of knowledge illuminating the path, whereby the world may become relatively happier, will always vary directly as man's susceptibility to its promptings: for "=Durch Mitleid wissend=" is not truer of Parsifal than of all other saviours.