यदा संहरते चायं कूर्मोऽङ्गानीव सर्वश: |
इन्द्रियाणीन्द्रियार्थेभ्यस्तस्य प्रज्ञा प्रतिष्ठिता || 58||
yadā sanharate chāyaṁ kūrmo ’ṅgānīva sarvaśhaḥ
indriyāṇīndriyārthebhyas tasya prajñā pratiṣhṭhitā
yada sanharate chayam kurmo ’nganiva sarvashah
indriyanindriyarthebhyas tasya prajna pratishthita
BG 2.58: One who is able to withdraw the senses from their objects, just as a tortoise withdraws its limbs into its shell, is established in divine wisdom.