ἀνδρὸς σπλάγχνον ἐκμαθεῖν → learn a man's heart, learn a man's inward nature
P. and V. ἀκίνητος, βέβαιος, ἀσφαλής, P. μόνιμος, ἀμετάπτωτος, V. ἔμπεδος.