One of the greatest Catholic thinkers of the twentieth century, Etiene Gilson, discusses, interprets, and expounds, in his work "The Elements of Christian Philosophy," the Philosophy of St Thomas Aquinas in terms that the educated laymen and student will find beneficial and fairly simple to soak in. This is a great summation of the "Summa," and should be placed next to Ralph McInerny's work and other accomplished commentators' treatment of St Thomas' oeuvre.