Srila Prabhupada said (January 27, 1975):

Acyutananda Swami, he went to some place, there was a big sannyasi, very well known sannyasi. So he went to sell some books in their asrama. So one of his student, one of his disciple, he canvassed Acyutananda, "Why don't you ask some question to Swamiji?" He clearly said, "I have nothing to question from your Swamiji. I know better than him." [laughter] So actually, bring any so-called yogis, svamis or incarnation, our student will challenge him. He does not know anything. We have got such a nice book of knowledge, Bhagavad-gita. By the arguments and proposition in the Bhagavad-gita we can capture all these rascals and nonsense.