The soul of man is divided into three parts, intelligence, reason, and passion. Intelligence and passion are possessed by other animals, but reason by man alone.

Τὴν δ᾽ ἀνθρώπου ψυχὴν διαιρεῖσθαι τριχῆ, εἴς τε νοῦν καὶ φρένας καὶ θυμόν.

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Pythagoras. Quoted in "Pythagoras," The Lives and Opinions of Eminent Philosophers by Diogenes Laërtius. 3rd BC, bk. 8, ch. 1, sect. 30.