《梁书·列传·卷四十八》
答： 有飞禽，有走兽，这是飞翔和奔跑的不同情形；有人在，有鬼在，这是有形和无形的区别。
答曰： 有禽焉，有兽焉，飞走之别也；有人焉，有鬼焉，幽明之别也。
A: Among animals, some fly while some run. This is the difference between flying and running. Among creatures, some are human while some are ghosts representing the difference between the corporeal and the incorporeal.