Seeking explanation, ancient is also a heart, and the heart is also ancient, and the heart is connected with the heart. Love is human nature, people also have feelings, and people's feelings can be different from people's.
The ancients represented heaven and earth, and the heart represented the soul. Together, it is the space of the soul. The general idea is that the sky is the heart and the heart is the sky, which represents a realm of harmony between man and nature. With a broad mind, when the artistic conception of being cautious and independent reaches such a high level, you can plan great things.
Is a person with feelings (feelings: psychological state, joy, anger, love, hate, sadness, etc. ), so people have feelings and emotions. Only when there is emotional intersection between people can people understand each other, help each other and cooperate with each other.
The source may be Lei Yin's poem, but I'm not sure, haha.