If you discriminate too much, you limit yourself. If you are too demanding or too greedy, your mind is not rich and self-sufficient. If we lose our original self-sufficient mind, we will lose all precepts.
When your mind becomes demanding, when you long for something, you will end up violating your own precepts: not to tell lies, not to steal, not to kill, not to be immoral, and so forth. If you keep your original mind, the precepts will keep themselves.
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