The Teacher said, "The highest good is the original substance of the mind. When one deviates a little from this original substance, there is evil. It is not that there is a good and there is also an evil to oppose it. Therefore good and evil are one thing." Having heard our Teacher's explanation, I know that we can no longer doubt Master Ch'eng Hao's sayings, "Man's nature is of course good, but it cannot be said that evil is not our nature" (1) and "Good and evil in the world are both the Principle of Nature. What is called evil is not originally evil. It becomes evil only because of deviation from the Mean." (2)

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