His mind is steady who withdraws all his senses from all the (worldly) objects of senses, as a tortoise withdraws his limbs.
यदा संहरते चायं कूर्मोऽङ्गानीव सर्वशः। इन्द्रियाणीन्द्रियार्थेभ्यस्तस्य प्रज्ञा प्रतिष्ठिता॥