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Logistikon (λογιστικόν) our sense of reason.

• Thymoeides (θυμοειδές), our sense of honour and courage.

• Epithymetikon (ἐπιθυμητικόν), pertaining to our physical desires.

The goal was to have Logistikon rule over the other parts. Because Logistikon was the seat of the will, it offers us an early comparison to what we now call the Ego.