νέῳ δὲ σιγᾶν μᾶλλον ἢ λαλεῖν πρέπει → it's fitting for a young man to keep silence rather than to speak (Menander)
in a stately way: P. and V. σεμνῶς.
proudly: P. ὑπερηφάνως, μεγαλοφρόνως. V. ὑψικόμπως, ὑπερκόπως.