Show at all times so strong a regard for truth that your bare word shall carry more weight than the oaths of others.
διὰ παντὸς τοῦ χρόνου τὴν ἀλήθειαν οὕτω φαίνου προτιμῶν ὥστε πιστοτέρους εἶναι τοὺς σοὺς λόγους μᾶλλον ἢ τοὺς τῶν ἄλλων ὅρκους.
Original text (Ancient Greek)