TantraS, Viṃśam āhnikam, 3.0 tatra niyatabhavaṃ nityaṃ tanmayībhāva eva naimittikaṃ tadupayogi saṃdhyopāsanaṃ pratyaham anuṣṭhānaṃ parvadinaṃ pavitrakam ityādi //