Love, persuasion, and the soul › Why the soul moves itself

Before introducing the chariot, Socrates argues that soul is immortal (245c–246a). The argument identifies soul with what moves itself. Something moved only by another can stop moving when that external source stops. What moves itself, Socrates claims, does not lose its source of motion because it does not abandon itself. Self-motion is then presented as the originating source of motion for other things.

A first source cannot itself come into being from something prior, Socrates reasons, since that would make the prior thing the source instead. He also argues that the source cannot perish: if it disappeared, motion could neither originate again from it nor be restored through an independent beginning. Identifying soul with this self-moving source is supposed to establish its imperishability. This is a metaphysical argument about the origin of life and motion, not a description of horses inside a person.

Its vulnerable step deserves attention. Even if motion requires an originating principle, it does not follow without further argument that every individual soul must possess an indestructible existence. A critic can also ask why something that initiates its own activity could never cease to exist. The argument depends on a stronger conception of self-motion than the ordinary observation that living creatures move around. Recognizing that dependence helps us see what the chariot myth assumes without treating the immortality proof as uncontroversial.

Socrates then explicitly changes registers. Explaining what soul actually is would require a long, divine account; a shorter human account can describe what it resembles (246a). He offers the image of a winged team consisting of a charioteer and two horses. The distinction matters for interpretation. An argument about immortality and an imaginative representation of motivation perform different jobs, even though the speech places them together. The Stephanus-marked text presents both passages.