《后汉书·列传·荀韩钟陈列传》
阳性纯，因而能够施展；阴体顺，因而能够化。用礼调济音乐，气得以宣导和节制之，所以能够多子多孙，健康长寿。
阳性纯而能施，阴体顺而能化，以礼济乐，节宣其气。故能丰子孙之祥，致老寿之福。
Yang is purely active, so it can be put into operation; Yin is purely responsive, so it can be transformed. Ceremonies regulate music, using music to channel and constrain the qi, so people will have many children and grandchildren and enjoy health and longevity.