212. What is jiriki, the self power on which the Zen practitioner relies? The self in question here cannot be the ego self which the practitioner must come to realize, sooner or later, is transitory, insubstantial, illusory. The self that empowers Zen practice is called by various names, such as the True Self, Buddha Nature, the Heart-Mind, No-Mind. Encountering the True Self plunges the practitioner deeply into a mysterious realm where one is carried beyond the polarities of jiriki and tariki. Here the seventh and final proposition of Wittgenstein's Tractatus Logico Philosophicus rings true: 'Whereof one cannot speak, thereof one must be silent'.