Meaning of niveles de verdad del lenguaje by Felipe Lorenzo del Río

They are the philosophers of the Anglo-Saxon analytic philosophy and 20th century Vienna Circle, ( eg. Wittgenstein and Bertrand Russell ) who have made one of the fundamental objectives of the philosophical research language. Distinguished language which speaks of reality 0, e.g.: on the table there is a book; language 1: the proposition stating that " on the table there is a book " is true; language 2: Peter says that " the proposition stating that there is a book on the table is true " It is false and so we can continue indefinitely. Each language and meta-language has its level of truth. The apparent contradiction arises sometimes when they do not differentiate or levels, are confused as to say: I always lie. I tell the truth? The same thing happens when someone writes on a sheet of paper: the proposition that there is on the other side of this sheet is real and on the other hand writes: the proposition that there is on the other side of this folio is false.