ἰσχυριστέον
From LSJ
οὐκ ἔστιν αἰσχρὸν ἀγνοοῦντα μανθάνειν → there is no shame in, not knowing, inquiring
English (LSJ)
A one must maintain stoutly, Pl.R.533a.
Greek (Liddell-Scott)
ἰσχῡριστέον: ῥημ. ἐπίθ. τοῦ ἰσχυρίζομαι, δεῖ ἰσχυρίζεσθαι, Πλάτ. Πολ. 533Α.