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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...

cause of all in that genus; as fire, which is the maximum of heat, is the cause of all hot things. Therefore there must also be something which is to all beings the cause of their being, goodness, and every other perfection; and this we call God.28 The fifth way is taken from the governance of the world. We see that things which lack intelligence, such as natural bodies, act for an end, and this is evident from their acting always, or nearly always, in the same way, so as to obtain the best result.
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