He who longs to feel in his own soul the whole range of values and aims that have prevailed on earth until his day, and to sail round all the coasts of this ideal 'Mediterranean Sea'; who, from the adventures of his own inmost experience, would fain know how it feels to be a conqueror and discoverer of the ideal; as also how it is with the artist, the saint, the legislator, the sage, the scholar, the man of piety and the godlike anchorite of yore; such a man requires one thing above all for his purpose, and that is, great healthiness such healthiness as he not only possesses, but also constantly acquires and must acquire, because he is continually sacrificing it again, and is compelled to sacrifice it!