ācāryaṁ māṁ vijānīyān
ācāryaṁ māṁ vijānīyān nāvamanyeta karhicit |
na martya-buddhyāsūyeta sarva-devamayo guruḥ ||
(Śrīmad Bhāgavatam: 11.17.27; cited in Bhakti-rasāmṛta-sindhu: 1.2.99; Bhakti Sandarbha: 211)
“Know the ācārya to be me. One should never disrespect [him], and one should not engage in detraction [of him] out of consideration of [him being] a mortal. The guru is an embodiment of all the devas.”