While the Phaedo is most famous for its moving portrayal of Socrates' death and its arguments for the immortality of the soul, Ahrensdorf argues that the dialogue is primarily devoted to presenting Socrates' final defense of the philosophic life against the theoretical and political challenge of religion. Through a careful analysis of both the historical context of the Phaedo and the arguments and drama of the dialogue, Ahrensdorf argues that Socrates' defense of rationalism is singularly undogmatic and that a study of that defense can lead us to a clearer understanding and a deeper and richer appreciation of the case both for and against rationalism.