17.27 Therefore, devotion of persons of the first three stations who follow the Vedas in respect of sacrifices, austerities and gifts is called Sat, since it is auspicious. So the Vedas, Vedic acts and the three stations, expressed by the term 'brahmana,' since they are characterised by their connection with the words 'Om Tat Sat,' are to be distinguished from what are not the Vedas and Vedic.