yeṣāṁ gurau na japye vā
yeṣāṁ gurau na japye vā viṣṇau ca paramātmani |
nāsti bhaktiḥ sadā teṣāṁ vacanaṁ parivarjayet ||
(Vaiṣṇava Tantra; cited in Hari-bhakti-vilāsa: 12.418)
“Always completely reject the statements of those who do not have bhakti to guru, a mantra [lit., “that which is to be chanted”], or the Paramātmā Viṣṇu.”