"My dear, dear anxious friend,"—said she, in mental soliloquy, while walking downstairs from her own room, "always overcareful for every body’s comfort but your own; I see you now in all your little fidgets, going again and again into his room, to be sure that all is right."
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Perhaps the best known soliloquy is written by Shakespeare in Hamlet: "To be, or not to be: that is the question..."
By the end of his soliloquy Hamlet concludes that he should not murder Duncan.