棺槨，蓋取諸大過繫辭下傳第二章012

古時候的喪葬，用木材厚厚地堆在尸體上面，埋在荒野中，不設立墳墓，也不植樹，居喪沒有一定的期限。後世聖人，制定喪禮，換用棺椁以殯葬，是取象于大過卦。

古之葬者，厚衣之以薪，葬之中野，不封不樹，喪期无數。

後世聖人易之以棺槨，蓋取諸大過。

When the ancients buried their dead, they covered the body thickly with pieces of wood, having laid it in the open country. They raised no mound over it, nor planted trees around; nor had they any fixed period for mourning. In subsequent ages the sages substituted for these practices the inner and outer coffins. The idea of this was taken, probably, from Da Guo (the twenty-eighth hexagram).