θέασις
From LSJ
ποταμῷ γὰρ οὐκ ἔστιν ἐμβῆναι δὶς τῷ αὐτῷ → it is impossible to step twice in the same river, you cannot step twice into the same rivers
English (LSJ)
εως, ἡ, A contemplation, Porph.Abst.4.6. II insight, Gal. 1.52.
German (Pape)
[Seite 1190] ἡ, die Betrachtung, Porphyr.