Video from the Thomistic Institute
The Principle of Non-Contradiction (Aquinas 101)
"The principle of non-contradiction stands as a kind of witness that human beings can know something solid and true about reality as a whole. The great calling of philosophy and metaphysics is to say much more about reality as a whole. The Principle of Non-Contradiction (Aquinas 101) - Fr. James Brent, O.P." from video introduction.