CC Antya 8.27
sarva loka nindā kare, nindāte nirbandha
One who is attached to dry speculative knowledge has no relationship with Kṛṣṇa. His occupation is criticizing Vaiṣṇavas. Thus he is situated in criticism.
Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura has explained in his Anubhāṣya that the word nirbandha indicates that Rāmacandra Purī had a steady desire to criticize others. Impersonalist Māyāvādīs, who have no relationship with Kṛṣṇa, who cannot take to devotional service, and who simply engage in material arguments to understand Brahman, regard devotional service to Kṛṣṇa as karma-kāṇḍa, or fruitive activities. According to them, devotional service to Kṛṣṇa is but another means for attaining dharma, artha, kāma and mokṣa. Therefore they criticize the devotees for engaging in material activities. They think that devotional service is māyā and that Kṛṣṇa or Viṣṇu is also māyā. Therefore they are called Māyāvādīs. Such a mentality awakens in a person who is an offender to Kṛṣṇa and His devotees.