Latin saying dura lex sed lex is relatively very often used in legal life. But what is interesting – nowadays the politicians love it much more than the lawyers, because the latter are aware of its simplified character. The author considers primary source (Digesta) and contemporary meaning of this saying as well. He confronts it with another famous latin saying – lex iniusta non est lex. In conlusion – in author’s opionion, however latin legal terminolology is a source of legal prudence cumulated through ages, but its proper apllication needs the knowledge of its primary meaning and contemporary as well.