《礼记·乐记》
自己唱了起来以后，会觉得天地也在响应，阴阳和顺，星辰按序运行，万物各得其所。
动己而天地应焉，四时和焉，星辰理焉，万物育焉。
When you start singing, you will feel that the whole heaven and earth are responding to you. Everything is in harmony. The sun, moon, and stars are running in order, and every creature is getting what it should.