This early work of philosophy is both expensive and hard to find in its first edition. It contains metaphysical ideas of being and essence by influential philosopher and theologian Thomas Aquinas. This is a fascinating work and thoroughly recommended for anyone interested in philosophy. Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.