When my master and teacher [R. Schneur Zalman of Liadi] was in a state of d'veikut (lit. "attachment," a trance-like state of ecstatic cleaving to G-d) he would cry out: "I want nothing at all! I don't want Your 'garden of eden,' I don't want Your 'world to come'... I want nothing but You alone."
Related by Rabbi Schneur Zalman's grandson, Rabbi Menachem Mendel of Lubavitch