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A Summa of the Summa: The Essential Philosophical Passages of St. Thomas Aquinas’ Summa Theologica is unavailable, but you can change that!

This unique book combines selected essential philosophical passages from Aquinas’ Summa with footnotes and explanations by Peter Kreeft. Kreeft selected those passages from Aquinas that are intrinsically important, non-technical enough to be intelligible to modern readers, and most likely to be used in a class or by an independent reader. Kreeft’s detailed footnotes explain difficult or technical...

because the predicate is included in the essence of the subject, as “Man is an animal,” for animal is contained in the essence of man. If, therefore the essence of the predicate and subject be known to all, the proposition will be self-evident to all; as is clear with regard to the first principles of demonstration, the terms of which are common things that no one is ignorant of, such as being and non-being, whole and part, and such like. If, however, there are some to whom the essence of the predicate
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