Moreover, he is not right in asserting that "from the fact that two things are mutually dependent, it does not follow that they are equivalent," because there are several kinds of interdependence, in some of which two things can be equivalent. For instance, bricks, mutually dependent in their forming an arch, cannot be equivalent one with another; but water and waves, being mutually dependent, can be identified. In like manner fire and heat, air and wind, a machine and its working, mind and body.[FN#182] [FN#180] The master strongly condemns the immortality of the soul as the heterodox doctrine in his Sho-bo-gen-zo. The same argument is found in Mu-chu-mon-do, by Mu-so Koku-shi. [FN#181] 'Creative Evolution,' pp. 354, 355. [FN#182] Bergson, arguing against the dependence of the mind on brain, says: "That there is a close connection between a state of consciousness and the brain we do not dispute. But there is also a close connection between a coat and the nail on which it hangs, for if the nail is pulled out, the coat will fall to the ground. Shall we say, then, that the shape of the nail gave the shape of the coat, or in any way corresponds to it? No more are we entitled to conclude, because the psychical fact is hung on to a cerebral state, that there is any parallelism between the two series, psychical and physiological." We have to ask, in what respects does the interrelation between mind and body resemble the relation between a coat and a nail? 3. The Irrationality of the Belief of Immortality.