"And then the sly arch-lover that he was, he said the subtlest thing of all: that the lover was nearer the divine than the beloved; for the god was in the one but not in the other - perhaps the tenderest, most mocking thought that ever was thought, and source of all the guile and secret bliss the lover knows."

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But as Van casually directed the searchlight of backthought into that maze of the past where the mirror-lined narrow paths not only took different turns, but used different levels (as a mule-drawn cart passes under the arch of a viaduct along which a motor skims by), he found himself tackling, in still vague and idle fashion, the science that was to obsess his mature years - problems of space and time, space versus time, time-twisted space, space as time, time as space - and space breaking away from time, in the final tragic triumph of human cogitation: I am because I die.

— Vladimir Nabokov