《庄子·杂篇·外物》
大凡道德总不希望有所壅塞，壅塞就会出现梗阻，梗阻而不能排除就会出现相互践踏，相互残踏那么各种祸害就会随之而起。
凡道不欲壅，壅则哽，哽而不止则跈，跈则众害生。
Morality in general does not like to be obstructed, for obstruction will cause stagnation, and stagnation which cannot be expelled will lead to mutual trampling, and from mutual trampling all sorts of evils will arise.