νομιστέος
From LSJ
ἀσκέειν, περὶ τὰ νουσήματα, δύο, ὠφελέειν, ἢ μὴ βλάπτειν → strive, with regard to diseases, for two things — to do good, or to do no harm | as to diseases, make a habit of two things — to help, or at least, to do no harm
English (LSJ)
α, ον,
A to be enacted (νομίζω 1.2), Pl.R.608b. II νομιστέον, one must account, deem, Id.Sph.230d, Men.550, LXXEp.Je. 40, Porph.Abst.1.12, etc.