sāṃkhyayoga - Verse śloka 58
śloka 58
yadā saṃharate cāyaṃ kūrmo'ṅgānīva sarvaśaḥ |
indriyāṇīndriyārthebhyastasya prajñā pratiṣṭhitā ||2-58||
Translation
Just as a tortoise withdraws its limbs, so when this man withdraws his senses from the objects of the senses on all sides, his wisdom becomes steady.