σκληρόν σοι πρὸς κέντρα λακτίζειν → it is hard for thee to kick against the pricks, it is hard for you to kick against the goads
inform confidentially: P. ἐν ἀπορρήτῳ λέγειν (dat.) (Plato, Theaetetus 152C).
secretly: P. and V. λάθρα.
