We sometimes feel inconvenienced by the hindrances offered by these impersonalists, but we do not care about their so-called philosophy, for we are propagating our own philosophy as presented in Bhagavad-gita As It Is and getting successful results. Theorizing as if devotional service were subject to their mental speculation, both kinds of Mayavadi impersonalists conclude that the subject matter of bhakti-yoga is a creation of maya and that Krsna, devotional service and the devotee are also maya. Therefore, as stated by Sri Caitanya Mahaprabhu, mayavadi krsne aparadhi: “All the Mayavadis are offenders to Lord Krsna.” (Cc. Madhya 17.129) It is not possible for them to understand the Krsna consciousness movement;  therefore we do not value their philosophical conclusions. However expert such quarrelsome impersonalists are in putting forward their so-called logic, we defeat them in every respect and go forward with our Krsna consciousness movement. Their imaginative mental speculation cannot deter the progress of the Krsna consciousness movement, which is completely spiritual and is never under the control of such Mayavadis.

Srila Prabhupada, CC Adi 7.39, ppt.