《太平广记·卷五十七·女仙二》
大概是太慈悲不合乎人欲，奔走而不如灵飞，适宜抚慰，以完成他的志向。
盖大慈而不合夫人欲，奔走而不及灵飞，适宜慰抚，以成其志。
It is probably too merciful and does not conform to human desires. Running is not as good as flying. It is suitable for comfort and to fulfill his ambitions.