So Cyril speaks frequently of the Holy Spirit as proceeding from the Father and being (ειναι) and abiding (μένειν) in the Son; as also of the Spirit as being of the Son and having His nature in Him (ἐξ αὐτοῦ καὶ ἐμπεφυκὼς αὐτῷ). The idea seems to have been that as the Son is in the bosom of the Father so the Spirit is in the bosom of the Son. The Spirit was compared again to the energy, the natural, living energy, of the Son (ἐνέργεια φυσικὴ καὶ ζωσα, τὸ ἐνεργὲς τοῦ υἱοῦ), Cyril, Dial 7 ad Hermiam. Such terms as προβολεὺς ἐκφαντορικοῦ πνεύματος, the Producer, or, Emitter of the revealing Spirit, and the ἔκφανσις or ἔλλαμψις, the revealing, the forth-shewing, were also used to express the procession of the one eternal Person from the Other as like the emission or forth-shewing of light from light.