Book Review: On What Matters, volume 3

A book review on LessWrong argues that Derek Parfit's 'On What Matters, Volume Three' deserves far more attention than it currently receives, especially in effective altruism circles. According to reviewer Rauno Arike, the final volume contains crucial conversations between Parfit and prominent moral philosophers—Allan Gibbard, David Railton, and Simon Blackburn among them—who previously disagreed with him on fundamental ethical questions. The review suggests these discussions represent genuine philosophical convergence, where thinkers moved beyond prior disagreements toward shared insights. Arike contends the volume represents Parfit's most refined treatment of moral philosophy—his final arguments for the existence of objective morality independent of individual preference.

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