Selected Writings of Thomas Aquinas

"Saint Thomas Aquinas is the figure chosen out by Dante in the Paradiso to sing the glories of truth which stretched from God in His heaven to the abyss, and his fame as a thinker has grown with the ages and is as fresh to-day as it was in his lifetime...
Since no one book can do S. Thomas justice, I have been forced to pick and choose out of his works a series of passages which will be sufficiently long and interconnected to convey the main theme of his philosophy. In the selection made there are examples of his method of argument and the way he arrives at his favourite conclusions." - Summary by Preface