It's not so much that agency is an illusion as that you think it's more important than it is.
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If you think you are the main determining factor in the character of your life, your relationships, your role, your profession... you are wrong.
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To be influential, too, is utterly irrelevant in the context of agency. Who or what is influential? Not anything in you that chooses.
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There is no significance so great, no delusion so grandiose, it could contain even a fraction of our self-importance.
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