You speak of impersonalism. We welcome all impersonalists to come because if they are real impersonalists they will see that our Society is perfect and complete. Ramanujacarya is considered to be very stalwart acarya simply because he completely defeated the impersonalism of Sankaracarya. And even to this day in India, especially in the south, the followers of Ramanujacarya and Sankaracarya engage in talks and always the Sankarites are defeated. But most of the so-called impersonalists of today are rogues.

From Srila Prabhupada's letter to Atreya Rsi dasa, 26th January, 1972