"While in a state of philosophic pessimism and general depression of spirits about my prospects, I went one evening into a dressing-room in the twilight to procure some article that was there; when suddenly there fell upon we without any warning, just as if it came out of the darkness, a horrible fear of my own existence. Simultaneously there arose in my mind the image of an epileptic patient whom I had seen in the asylum, a black-haired youth with greenish skin, entirely idiotic, who used to sit all day on one of the benches, or rather shelves against the wall, with his knees drawn up against his chin, and the coarse gray undershirt, which was his only garment, drawn over them inclosing his entire figure. He sat there like a sort of sculptured Egyptian cat or Peruvian mummy, moving nothing but his black eyes and looking absolutely non-human. This image and my fear entered into a species of combination with each other. That shape am I, I felt, potentially, nothing that I possess can defend me against that fate; if the hour for it should strike for me as it struck for him. There was such a horror of him that it was as if something hitherto solid within my breast gave way entirely and I became a mass of quivering fear. After this the universe was changed for me altogether. I awoke morning after morning with a horrible dread at the pit of my stomach, and with a sense of the insecurity of life that I never knew before, and that I have never felt since. It was like a revelation; and although the immediate feelings passed away, the experience has made me sympathetic with the morbid feelings of others ever since."
– William James