Regarding the impersonalist swamis, don't try to mix with any Swami who has no knowledge of Krsna Consciousness. So their speaking is simply maya, therefore they are called Mayavadis. Lord Caitanya has warned us that anyone who listens to or tries to understand the impersonalist philosophy is doomed, his devotion will become dried up.
Letter to Upendra, 26 October, 1970