“Tomorrow, and tomorrow, and tomorrow, creeps in this petty pace from day to day.”
— William Shakespeare, Macbeth (1606)
Context
Macbeth has just been told that his wife is dead. Far from breaking down, he delivers a soliloquy of devastating philosophical detachment, finding life itself to be a meaningless succession of identical days.
How the repetition works
The triple "tomorrow" makes the future feel monotonous before it has even arrived. Each repetition adds not anticipation but identical, weary continuance. The repetition enacts the "petty pace" it describes — three tomorrows that creep, syllable by syllable, with nothing distinguishing one from the next.