There is no reason outside the heart, there is nothing outside the heart.
Initial Interpretation: There is no such thing as a heavenly principle outside the mind, and there is no such thing as a thing outside the mind.
Pot Tianshan people interpret:
The core of this sentence is what the meaning of "heart" is. My explanation is that this sentence is based on the idea that "the heart is reason", so "heart" refers to the heart of the unity of the human heart and the heavenly principle, that is, the heart of the unity of heaven and man, that is, the heart of the Tao of heavenly reason.
Lu Xiangshan said: "My heart is the universe, and the universe is my heart."
It can also be seen that there is a heavenly principle. The heart of all things, the heart that is one with the Heavenly Principle and all things, must be the Heavenly Principle and the Tao Heart, not the selfish desire of human beings.
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