The old man believes the world's greatest lie is that people's lives are controlled by fate, emphasizing the importance of free will.
The old man in the text believes that the world's greatest lie is that people's lives are controlled by fate. He challenges the notion that individuals are powerless to change their destiny and emphasizes the importance of free will. This belief contrasts with the fatalistic approach seen in ancient Greek texts like the Iliad and the story of Oedipus.
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