संयम्य गुदसंरोधाद्द्वाराणि नव चेतसः ।मात्रास्पर्शान्विचिन्वानो भावितस्वाङ्गचिद्धनः
In plain words
Restraining, by closing off the anus, the nine gates of the mind, sifting through the mātrā-sparśas -- the contacts of the senses with their objects -- having brought into contemplation the dense mass of consciousness (cid-ghana) within his own body,