I Tiresias, though blind, throbbing between two lives, Old man with wrinkled female breasts, can see At the violet hour
Tiresias watches the typist's joyless encounter with the young man carbuncular. Having experienced both male and female sexuality across millennia, Tiresias has "foresuffered all" — every degraded coupling in history. This is not voyeurism but exhausted prophecy.
Eliot's own notes identify Tiresias as "the most important personage in the poem" — the consciousness that unites all the poem's voices.