To Say Of What Is That It Is

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.

-- Aristotle (384 BC - 322 BC), Greek philosopher and polymath during the Classical period in Ancient Greece, Definition of Truth, Metaphysics 1011b25, as quoted by David, Marion "Correspondence Theory of Truth" in Stanford Encyclopedia of Philosophy (2005)