"Truth": what is that? _x000D_
What is the "essence" of the truth? _x000D_
What constitutes each of the statements in true? _x000D_
Truth is righteousness. _x000D_
The truth is the coincidence, founded on righteousness, the statement of the thing. _x000D_
This work, in which the author explores the limits of knowledge of the truth (of being), contains the lessons he taught at the University of Freiburg between 1931 and 1932 from the parable of the Cave and the Theaetetus of Plato .