1. 67

    सर्वस्रोतोनिबन्धेन प्राणशक्त्योर्ध्वया शनैः । पिपीलस्पर्शवेलायां प्रथते परमं सुखम् ॥ ६७ ॥

    By blocking all the channels (of perception) the prana- shakti moves slowly upwards (through the spinal column). At that time, feeling the sensation of an ant crawling in the body, one experiences the supreme bliss.