Idiotes, or ‘particularity,’ is the term chosen to express the individual characteristic. The difference between the Persons, says Basil (c. Eun. 1.19), consists in their plurality and in the ‘particularities’ which characterise each: and again (Ep. 38.8), everything that belong to Father is seen in the Son, and everything that belongs to the Son belongs also to the Father, since the Son abides whole in the Father and again possesses the Father whole in Himself; the hypostasis of the Son, so to speak, the ‘form’ and presentation (prosopon) of the recognition of the Father, and the Father’s hypostasis is recognised in the form of the Son; there remains the supplementary particularity with a view to the clear distinction of the hypostaseis. These particularities are called by Basil γιωριστικαι ἰδιότητες (‘identifying particularities’) (Ep. 38.5, c. Eun. 2.29), and they consist in being gennetos and being agennetos (c. Eun. ib.): or as in Greg. Naz. (Or. 25.16), agennesia, gennesis and ekpempsis (promission). They are modes of being, not elements in being. Later theology called them for obvious reasons ἰδιότητες ὑποστατικαί (pseudo Cyr. de ss. Trin. 9: “agennesia and gennesis and ekporeusis (procession): in these hypostatic particularities alone do the three holy hypostaseis differ from one another.”) In the form ‘idioma’ this term goes back to Alexander of Alexandria (ap. Thdt. h. e. 1.4.52), who states that being agennetos is the only idioma of the Father.