Withdrawing his senses like the tortoise withdrawing its limbs, one should govern his senses and mind, cultivate a thoroughly peaceful understanding, and seek to master every subject.
इन्द्रियाण्युपसंहृत्य कूर्मोऽङ्गानीव सर्वशः। क्षीणेन्द्रियमनोबुद्धिर्निरीहः सर्वतत्त्ववित्॥