यदा संहरते चायं कूर्मोऽङ्गानीव सर्वशः | इन्द्रियाणीन्द्रियार्थेभ्यस्तस्य प्रज्ञा प्रतिष्ठिता
yadā saṃharate cāyaṃ kūrmo.aṅgānīva sarvaśaḥ . indriyāṇīndriyārthebhyastasya prajñā pratiṣṭhitā
當一個人能像烏龜完全收回四肢一樣，將感官從感官對象中完全收回時，他的智慧便已堅定不移。
And when this one fully withdraws the senses from the objects of the senses, as a tortoise wholly (withdraws) the limbs, then his wisdom remains established.
收攝感官被稱為「制感」（Pratyahara）或抽象。心識天生傾向於追逐外在對象。瑜伽士（Yogi）一次又一次地將心識從感官對象中收回，並將其固定於自性（真我）之上。一位具備制感能力的瑜伽士，即使在擁擠的地方，也能在眨眼之間收攝感官，進入三摩地（Samadhi）。他不受任何喧囂嘈雜的干擾。即使在戰場上，他也能透過收攝感官，安住於其中心——自性。實踐制感的人，對世間而言如同已逝，不受外界振動的影響。他隨時都能憑藉意願，將感官完全置於自己的掌控之下，感官成為他順從的僕人或工具。
Withdrawal of the senses is Pratyahara or abstraction. The mind has a natural,tendency to run towards external objects. The Yogi again and again withdraws the mind from the objects of the senses and fixes it on the Self. A Yogi who is endowed with the power of Pratyahara can enter into Samadhi even in a crowded place by withdrawing his senses within the twinkling of an eye. He is not disturbed by tumultuous sounds and noises of any description. Even on the battlefield he can rest in his centre? the Self? by withdrawing his senses. He who practises Pratyahara is dead to the world. He will not be affected by the outside vibrations. At any time by mere willing he can bring his senses under his perfect control. They are his obedient servants or instruments.