《史记·八书·乐书》
乐太过则废事，后必有忧患，礼太简则不易周全，往往有偏漏。
乐极则忧，礼粗则偏矣。
If the music is too excessive, it will ruin the work, and there will be worries and troubles later; if the ritual is too simple, it will not be comprehensive, and there will often be bias and omissions.