If you were offered the chance to live your own life again, would you seize the opportunity? The only real philosophical answer is automatically self-contradictory: 'Only if I did not know that I was doing so.' To go through the entire experience once more would be banal and Sisyphean—even if it did build muscle—whereas to wish to be young again and to have the benefit of one's learned and acquired existence is not at all to wish for a repeat performance, or a Groundhog Day. And the mind ought to, but cannot, set some limits to wish-thinking. All right, same
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