@MJA,
""To say of what is that it is not, or of what is not that it is, is false, while to say of what is that it is, and of what is not that it is not, is true" is Aristotle's definition of truth (
Metaphysics 1011b25), and in this, The Philosopher seems to be saying that saying truth is truthful when it corresponds to the truth. This position would appear to entail a correspondence theory of truth, even though Aristotle leaves open exactly what truthfulness corresponds TO. Now THAT would be an interesting discussion.