摩訶止觀 7.91

7.91

居二藏間，穢濁浹潤，乍懸乍壓，或熱或冷，七日一變，十月懷抱。若六皰成就，形相具足，日月已滿，轉向產門。《大論》云：「此身非化生，亦非蓮華生，但從尿道出。」此處卑猥，底中廝惡。是名「住處不淨」。

Dwelling between the two viscera, soaked and moisturized by filth, now suspended, now compressed, sometimes hot, sometimes cold, changing every seven days, harbored for ten months. When the six vesicles are accomplished and the physical form is fully complete, the months and days being fulfilled, it turns toward the birth canal. The Da zhidu lun says: 'This body is not born of transformation, nor is it born from a lotus; it comes forth only from the urinary tract.' This place is base and vile, foul and wretched to the utmost. This is called 'impurity of dwelling place.'