Mayavadi philosophers and the pancopasakas cannot in the least understand the existence of the spiritual world and the blissful variegatedness there. They cannot understand the Absolute Truth and its spiritual varieties — name, form, qualities and pastimes. Consequently they conclude that Krsna’s transcendental activities are maya. To avoid this misconception one has to directly cultivate knowledge about the holy name of the Lord. Mayavadi philosophers do not know this fact, and therefore they commit great offenses. One should not hear anything about Krsna or devotional service from the mouths of Mayavadi impersonalists.

From Srila Prabhupada’s purport to Cc Madhya 17.127