It will be surmised that I should not like to take leave ungratefully of that period of severe sickness, the advantage of which is not even yet exhausted in me: for I am sufficiently conscious of what I have in advance of the spiritually robust generally, in my changeful state of health. A philosopher who has made the tour of many states of health, and always makes it anew, has also gone through just as many philosophies: he really _cannot_ do otherwise than transform his condition on every occasion into the most ingenious posture and position,--this art of transfiguration _is_ just philosophy. We philosophers are not at liberty to separate soul and body, as the people separate them; and we are still less at liberty to separate soul and spirit. We are not thinking frogs, we are not objectifying and registering apparatuses with cold entrails,--our thoughts must be continually born to us out of our pain, and we must, motherlike, share with them all that we have in us of blood, heart, ardour, joy, passion, pang, conscience, fate and fatality. Life--that means for us to transform constantly into light and flame all that we are, and also all that we meet with; we _cannot_ possibly do otherwise. And as regards sickness, should we not be almost tempted to ask whether we could in general dispense with it? It is great pain only which is the ultimate emancipator of the spirit; for it is the teacher of the _strong suspicion_ which makes an X out of every U[1], a true, correct X, _i.e.,_ the ante-penultimate letter.... It is great pain only, the long slow pain which takes time, by which we are burned as it were with green wood, that compels us philosophers to descend into our ultimate depths, and divest ourselves of all trust, all good-nature, veiling, gentleness, and averageness, wherein we have perhaps formerly installed our humanity. I doubt whether such pain "improves" us; but I know that it _deepens_ us. Be it that we learn to confront it with our pride, our scorn, our strength of will, doing like the Indian who, however sorely tortured, revenges himself on his tormentor with his bitter tongue; be it that we withdraw from the pain into the oriental nothingness--it is called Nirvana,--into mute, benumbed, deaf self-surrender, self-forgetfulness, and self-effacement: one emerges from such long, dangerous exercises in self-mastery as another being, with several additional notes of interrogation, and above all, with the _will_ to question more than ever, more profoundly, more strictly, more sternly, more wickedly, more quietly than has ever been questioned hitherto. Confidence in life is gone: life itself has become a _problem._--Let it not be imagined that one has necessarily become a hypochondriac thereby! Even love of life is still possible--only one loves differently. It is the love of a woman of whom one is doubtful.... The charm, however, of all that is problematic, the delight in the X, is