One of the greatest science fiction epics ever written. This book has it all: mind-expanding drugs, human computers, political intrigue, interstellar economics, and big-... worms. The reader should take from this book a sense of grandness of scale. The messianic fervor of the Fremen, the calculated patience of the Bene Gesserit eugenics program, the ecological ambition of Liet Kynes, and the universal-historical vision of the Quisatz Haderach, all ought to awaken us to the necessity and danger of human activity on the universal-historical timescale. That is the scale on which we all operate, whether we know it or not. Some of the themes in this book, which was written in the mid-1960's, foreshadow the adolescent field of chaos theory. In particular, the notion that seemingly insignificant local events can have calamitous effects on future history is analogous to the butterfly effect. Also, Herbert's conception of prophecy as a probability tree branching infinitely through time enjoys some endorsement from quantum physics.