The purpose of reducing environmental noise is to give people a quiet environment. A quiet environment helps people to calm down, relieve physical and mental stress, reduce the burden on the brain and reduce oxygen demand. It is found that after quietness, brain waves are in a stable and harmonious state, breathing times are reduced, heart rate is slowed down, blood pressure is stable, and immune function is improved. Emotion changes from negative to positive, which has a good effect on preventing psychosomatic diseases. Reducing noise is beneficial to physical and mental health, which was reflected in Huangdi Neijing many years ago. In Huangdi Neijing, god's rest is advocated. The health-preserving sutra in Huangdi Neijing says: "Quiet means God hides, while urgent means death;": "Quiet means God hides, and urgent means death", which means that God wants to be quiet and not impetuous. Traditional Chinese medicine believes that "those who gain the spirit prosper, those who lose the spirit die", and it is important to recuperate. Therefore, the way to cultivate the mind lies in the word "quietness", so as to keep one's spiritual and emotional activities in an indifferent and quiet state, so as to achieve purity, nothing inside and nothing outside.

The idea of purity and self-cultivation has a long history, starting from Laozi and Zhuangzi. Laozi first put forward the idea of "quietness" and took peace of mind as the way of health preservation. In the Tao Te Ching, he advocates being quiet and thinking less, and quietism requires achieving the purpose of "being quiet" in order to achieve the purpose of quietness. Zhuangzi inherited Laozi's thought, and he thought: "If you hold God for peace, you will be self-righteous, clear and quiet, and you will get" eternal life "."The water is still bright, but only the spirit of love. "But Zhuangzi's thought of stillness is more comprehensive than Lao Zi's. He realized that stillness is not absolute stillness, but there is movement in stillness and stillness in movement.