Following in the tradition of the legendary Togakure Ryu of Japan, whose fighting techniques and lore inspired the fascination of westerners with Ninja warriors, he offers guidelines on how to tell sham from authenticity, how to keep friends while developing power, how to voyage safely into the inner landscape, and how to deal with dark forces-incarnate and disincarnate. At the same time, he provides exercises, tests, and adventures for the courageous-as well as spiritual and ethical compass.

    Thunder in the Sky presents two secret classics of this ancient Chinese tradition. The commentary by Thomas Cleary—the renowned translator of dozens of Asian classics—highlights the contemporary application of these teachings.

    Newton s copy of this work (located at University of Wisconsin-Madison) contains much alchemical marginalia of a sincere and erudite nature.