From Durrenmatt's The Assignmennt
D. had listened to F.’s report and absently ordered a glass of wine, even though it was just eleven o’clock, gulped it down with an equally absent air, ordered a second glass, and remarked that he was still pondering the useless problem of whether the law of identity A = A was correct, since it posited two identical A’s, while actually there could only be one A identical with itself, and anyway, applied to reality it was quite meaningless, since there was no self-identical person anywhere, because everyone was subject to time and was therefore, strictly speaking, a different person at every moment, which was why he, D., sometimes had the impression that he was a different person each morning, as if a different self had replaced his previous self and were using his brain and consequently his memory, making him all the more glad that he was a logician, for logic was beyond all reality and removed from every sort of existential mishap, and so he would like to respond to the story she had ...