τεκμαρτέος
From LSJ
ὡς μήτε τὰ γενόμενα ἐξ ἀνθρώπων τῷ χρόνῳ ἐξίτηλα γένηται → in order that so the memory of the past may not be blotted out from among men by time
English (LSJ)
α, ον,
A to be determined, πρός τι according to... Aret. CA1.1. II τεκμαρτέον, one must determine, τινί τι Hp.Off.15; one must judge, estimate, Archig. ap. Orib.46.27.1.