It was in May, 1560, when Cardan was fifty-two years of age. His son had just been publicly condemned for poisoning. No misfortune could wound more deeply Cardan’s already sensitive soul. He loved his son with all a father’s tenderness, as is witnessed by his fine verses, _De Morte Filii_, in which there is the imprint of real passion. He hoped also for a grandson who should resemble himself. Drawn more and more into insane ideas by grief, he saw in this condemnation the hands of persecutors. “Thus overwhelmed, I sought distraction in vain in study or in play. In vain I bit myself and struck my arms and legs. It was my third night of sleeplessness, about two hours before dawn. I saw that there was nothing else for me but to die or go mad. Therefore I prayed God to snatch me entirely away from life. And then, against my expectation, sleep took possession of me, and at the same time I heard a person approaching me, whose form I could not see, but who said, ‘Why grieve about your son? Put into your mouth the precious stone which you bear suspended from your neck, and as long as you carry it there you will not think of your son.’ On waking up, I asked myself what connection there could be between forgetfulness and an emerald; but as I had no other resource, I recalled the sacred words, ‘_Credidit et reputatum ei est ad justitiam_’; I put the emerald into my mouth, and then, against all expectation, everything that recalled my son vanished from my memory. It was so for a year and a half. It was only during my meals, and at my public lectures, when I was unable to keep the precious stone in my mouth, that I fell back into my old grief.” This singular cure had its pretext in the double sense of the Italian word _gioia_, which means at once “joy” and “jewel.” Cardan had, however, no need of the revelation of a genius, for in his own works he had already recognized a consoling virtue in precious stones, due to the bond of this absurd etymology.[168] A megalomaniac, he called himself “the seventh physician since the creation of the world;” he claimed to know the things which are before and above us, and those which shall come after.[169] Like Rousseau and like Haller, Cardan, during the last days of his tormented existence, wrote his own life; he also foretold the exact date of his death, which he looked for, and perhaps himself brought about, in order that his horoscope should not be made to lie.[170]