μηδενὶ συμφορὰν ὀνειδίσῃς, κοινὴ γὰρ ἡ τύχη καὶ τὸ μέλλον ἀόρατον → never mock a disaster, fate is common to all and the future unknown
make a thing sure: P. βεβαιοῦν.
ratify: P. and V. κυροῦν, ἐπικυροῦν, ἐμπεδοῦν (Plato, also Ar.).
encourage: P. and V. θρασύνειν, θαρσύνειν, P. ἐπιρρωννύναι; see encourage.