Note 116 — Chapter XI · THE KINGDOM OF THE SOUL.
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In the Epicurean system atoms of soul are dispersed amongst atoms of body, there being a mixture of the two, which however does not go beyond juxtaposition; in the Stoic system soul permeates body. The Stoic explanation is frequently referred to by opponents as a reductio ad absurdum: τῷ λέγοντι τὴν ψυχὴν σῶμα ἕπεται τὸ σῶμα διὰ σώματος χωρεῖν Alex. Aphr. Arist. Top. ii 93 (Arnim ii 798). The relation of the principate to the man as a whole is also called σύστασις (constitutio); ‘constitutio est principale animi quodam modo se habens erga corpus’ Sen. Ep. 121, 10.