“If I am I because I am I, and you are you because you are you, then I am I and you are you. But if I am I because you are you and you are you because I am I, then I am not I and you are not you!”
As quoted in Tales of the Hasidim : The Later Masters (1948) by Martin Buber as translated by Olga Marx
Variant translations:
If I am I, simply because I am I, and thou art thou, simply because thou art thou; then I am I and thou art thou. But if I am I because thou art thou, and thou art thou because I am I, then I am not I and thou art not thou.
As quoted in The Rift in Israel: Religious Authority and Secular Democracy (1971) by Samuel Clement Leslie, p. 145
If I am I, because you are you, and you are you, because I am I, then I am not I, and you are not you. But if I am I because I am I, and you are you because you are you, then I am I and you are you, and we can talk.
As quoted in Let Us Reason Together (1970) by William Berkowitz and William Leonard Laurence
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Menachem Mendel of Kotzk 8
Polish rabbi 1787–1859Related quotes

“YOU are a genius!… and I am a genius because I married you.”

Interview on her role in the Broadway play "Two for the Seesaw". The New York Times (1958).

Source: The Monkey Grammarian (1974), Ch. 6
Context: Repetitions, you wander about lost amid repetitions, you are merely a repetition among other repetitions. An artist of repetitions, a past master of disfigurations, a maestro of demolitions. The trees repeat other trees, the sands other sands, the jungle of letters is repetition, the stretch of dunes is repetition, the plethora is emptiness, emptiness is a plethora, I repeat repetitions, lost in the thicket of signs, wandering about in the trackless sand, stains on the wall beneath this sun of Galta, stains on this afternoon in Cambridge, a thicket and a stretch of dunes, stains on my forehead that assembles and disassembles vague landscapes. You are (I am) is a repetition among other repetitions. You are is I am; I am is you are: you are is I. Demolitions: I stretch out full length atop my triturations, I inhabit my demolitions.

“I am not getting you a brain, because I am not that kind of assistant, Dr. Frankenstein.”
Source: Kiss of Death