《孟子·滕文公章句下·第三节》
但是不经过父母允许，没有媒人的介绍，就钻洞偷看，爬墙偷偷幽会，那么父母、社会上的人都会看不起他们。
不待父母之命、媒妁之言，钻穴隙相窥，逾墙相从，则父母国人皆贱之。
But if you peek through a hole without your parents' permission and without a matchmaker's introduction, you sneak up the wall and secretly meet, then your parents and the people in the society will look down on them.