《礼记·文王世子》
但又为之改穿素服，住在室外，不听音乐，这只是表示个人的哀悼，骨肉之亲的感情尚存。
素服居外，不听乐，私丧之也，骨肉之亲无绝也。
But they did put on simple mourning clothes, lived outside, and did not listen to music; this just showed their personal grief, the feelings of flesh and blood were still there.