From Nietzsche Contra Wagner, 'Epilogue':
"I have often asked myself whether I am not more heavily obligated to the hardest years of my life than to any others. As my inmost nature teaches me, whatever is necessary as seen from the heights and in the sense of a great economy is also the useful par excellence: one should not only bear it, one should love it. Amor fati: that is my inmost nature. And as for my long sickness, do I not owe it indescribably more than I owe to my health? I owe it a higher health one which is made stronger by whatever does not kill it. I also owe my philosophy to it."