Shastram avagatyam mano-vak-deheih Krushnah sevyah (Having understood the scriptures, serve Shree Krushna with mind, speech and body)
This is the major premise of Pushtimarg according to Pu. Go. 108 Shree Shyammanoharji, from which all other minor premises are drawn. During the time of Shree Mahaprabhuji, shastram was referred to mainly of the Vedic texts which includes among others the four Vedas, the upanishadas, the six vedangs, the eighteen purans and further commentaries. Though Shree Mahaprabhuji accepted verbal testimony from the four main scriptures - Vedas, Gita, Brahmsutras and Shreemad Bhagvat - as the praman (proof), he as well as his sons - Gopinathji and Vitthalnathji - studied all the allied branches of contemporary knowledge as well. In current times, we have not only the Vedic scriptures (spiritual sciences), but also the abundance of modern scientific literatures (material sciences) to study as shastram. All these knowledge enhances our understanding of the greatness of the Supreme Lord and therefore, Shree Mahaprabhuji considers this as a background conditioning state before we can really serve Shree Krushna in all humility and gratefulness.