אָמַץ
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 (Strong)
a primitive root; to be alert, physically (on foot) or mentally (in courage): confirm, be courageous (of good courage, stedfastly minded, strong, stronger), establish, fortify, harden, increase, prevail, strengthen (self), make strong (obstinate, speed).