Karma
The law of karma is a special instance of the law of cause and effect, according to which all our actions of body, speech, and mind are causes and all our experiences are their effects.
The law of karma explains why each individual has a unique mental disposition, a unique physical appearance, and unique experiences. These are the various effects of the countless actions that each individual has performed in the past. We cannot find any two people who have created exactly the same history of actions throughout their past lives, and so we cannot find two people with identical states of mind, identical experiences, and identical physical appearances.
Each class is self-contained.
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