肇論新疏 1.164

1.164

謂凡情偏解，知住迷去、知去迷住；圓見之人一法雙了。特由迷悟雲泥，故去住相反。

This means that ordinary sentiment holds partial understanding: knowing abiding, it is confused about departing; knowing departing, it is confused about abiding. A person of complete vision understands both in a single dharma. It is solely because delusion and awakening are as far apart as clouds and mud that departing and abiding are mutually opposed.