Sam Harris - Death and the Present Moment.
Ethics. Axiomatic Theories of Truth. First published Mon Dec 26, 2005; substantive revision Mon Nov 4, 2013 An axiomatic theory of truth is a deductive theory of truth as a primitive undefined predicate.
Because of the liar and other paradoxes, the axioms and rules have to be chosen carefully in order to avoid inconsistency. Many axiom systems for the truth predicate have been discussed in the literature and their respective properties been analysed. Euthyphro by Plato.