1178
Śrīmad-Bhāgavatam
[Canto 3, Ch. 28]
The word  asteyam  is also very important for a  yogī .  Asteyam  means to refrain from theft. In the broader sense, everyone who accumulates more than he needs is a thief. According to spiritual communism, one cannot possess more than he needs for his personal maintenance. That is the law of nature. Anyone who accumulates more money or more possessions than he needs is called a thief, and one who simply accumulates wealth without spending for sacrifice or for worship of the Personality of Godhead is a great thief.
Svādhyāyaḥ  means reading the authorized Vedic scriptures. Even if one is not Kṛṣṇa conscious and is practicing the  yoga  system, he must read standard Vedic literatures in order to understand. Performance of  yoga  alone is not sufficient. Narottama dāsa Thākura, a great devotee and  ācārya  in the Gauḍīya Vaiṣṇava-sampradāya, says that all spiritual activities should be understood from three sources, namely saintly persons, standard scriptures and the spiritual master. These three guides are very important for progress in spiritual life. The spiritual master prescribes standard literature for the prosecution of the  yoga  of devotional service, and he himself speaks only from scriptural reference. Therefore reading standard scriptures is necessary for executing  yoga . Practicing  yoga  without reading the standard literatures is simply a waste of time.
TEXT 5
मौनं सदासनजयः स्थैर्यं प्राणजयः शनैः । प्रत्याहारश्चेन्द्रियाणां विषयान्मनसा हृदि ॥ ५ ॥
maunam sad-āsana-jayaḥ   sthairyam prāṇa-jayaḥ śanaiḥ   pratyāhāraś cendriyāṇām   viṣayān manasā hṛdi
maunam —silence;  sat —good;  āsana —yogic postures;  jayaḥ —controlling;  sthairyam —steadiness;  prāṇa-jayaḥ —controlling the vital air;  śanaiḥ —gradually;  pratyāhāraḥ —withdrawal;  ca —and;  indriyāṇām —of the senses;  viṣayāt —from the sense objects;  manasā —with the mind;  hṛdi —on the heart.
TRANSLATION
One must observe silence, acquire steadiness by practicing different yogic postures, control the breathing of the vital air, withdraw the senses from sense objects, and thus concentrate the mind on the heart.