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 told him but could only do so in very general terms: