"The heart of mountains and rivers is self-aware" is an idiom, which means that a person should be self-aware, understand his own abilities and limitations, and do not overestimate or underestimate himself.

The origin of this idiom is the story of the ancient Chinese musician Yu Boya and his friend Zhong Ziqi. Yu Boya and Zhong Ziqi were both musicians. Yu Boya could play the piano and Zhong Ziqi could play the flute. The two had similar interests and became good friends. One day, Yu Boya and Zhong Ziqi played the music "Mountain and Flowing Water" together. The two played together like water flowing down from the mountain, and the music was very pleasant to the ears. After the performance, Yu Boya said with emotion: "I play the piano very well, but the sound of the flute is still not as good as the sound of mountains and flowing water. Only by working with Zhong Ziqi can we play such beautiful music." This sentence became "The heart of mountains and flowing water" The origin of the idiom "self-knowledge".

This idiom reminds us to be humble, understand our own strengths and weaknesses, not to think too highly of ourselves or feel inferior, and to cooperate with others in order to achieve greater success.