Parmenides found a path to the truth and gave exact instructions as to how this path was to be followed: »Sage allein ist und vermeide jedes ist nicht!« (Say what-is and avoid what-is-not) In the language of this path, it is impossible to express erroneous knowledge. The study of Parmenides‹ didactic poem focuses on the question of the logic of such a language without the possibility of differentiation and according to the knowledge which it can express in general.