Phaedo

In Phaedo, Plato presents four arguments for the immortality of the soul: the argument from opposites, the theory of recollection, the argument from affinity (the soul is simple and immaterial like the forms), and the argument from the form of life. These arguments are delivered by Socrates in his prison cell during the final hours before his execution by hemlock poisoning in 399 BCE.

In Phaedo, Socrates is executed by drinking a cup of hemlock in 399 BCE, after being condemned by an Athenian jury on charges of impiety and corrupting the youth. The dialogue depicts his calm and philosophical acceptance of death, including his final words and the composure with which he drinks the poison.

The theory of recollection (anamnesis) in Phaedo argues that learning is actually a form of remembering knowledge that the soul possessed before birth. Socrates uses this theory to support the idea that the soul existed before the body, since it has access to concepts like equality that cannot be derived from sensory experience alone.

Phaedo is narrated by Phaedo of Elis, one of Socrates' followers who was present at his death. He recounts the events of that day to the Pythagorean philosopher Echecrates and others in the city of Phlius, creating a framing narrative that gives the dialogue its name and emotional weight.