προσεπιτείνω
From LSJ
ψυχῆς πείρατα ἰὼν οὐκ ἂν ἐξεύροιο πᾶσαν ἐπιπορευόμενος ὁδόν· οὕτω βαθὺν λόγον ἔχει → one would never discover the limits of soul, should one traverse every road—so deep a measure does it possess
English (LSJ)
A stretch still further: metaph., contend more earnestly, Id.3.24.14. 2 intensify still more, τὴν παροῦσαν ἐπιθυμίαν Phld. Rh.2.290S.; τὸ δίψος Plu.2.689e; τὴν καλὴν νεανιείαν Ph.2.306; τὴν ὀργήν J.BJ7.3.3:—intr., of fevers, Gal.7.859:—Pass., of wind, Ph. 2.99. II impose severer terms upon, τοὺς Καρχηδονίους Plb.1.63.2: abs., π. ταῖς βασάνοις use severer tortures, D.S.10.18. III intr., to be prolonged, Orib.Fr.74.