Svadhyayah means
Srimad-Bhagavatam
SB Canto 3
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 Ṭhākura, 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.