The truth is that only those who have been blessed by the Lord can fathom the spiritual science dealing with God. Dr. Radhakrishnan's book irrefutably proves this. The Māyāvādī philosophers are big offenders to the Supreme Lord, and therefore He never manifests Himself to them. As the Lord Himself declares in the Gītā (7.25), nāhaṁ prakāśaḥ sarvasya yoga-māyā samāvṛtaḥ muḍhaḥ: "I am never manifest to the foolish and unintelligent. For them I am covered by my internal potency..." All previous spiritual authorities have condemned the Māyāvādīs, but Lord Śrī Kṛṣṇa Caitanya Mahāprabhu has directly censured them, calling them the greatest offenders against the Supreme Lord. He said that if a person simply hears philosophy from a Māyāvādī, his spiritual life is in jeopardy. As quoted in the Śrī Caitanya-caritāmṛta (Madhya 17.129-132 and 134-135), the Lord speaks about the Māyāvādīs in this way:
Śrī Caitanya Mahāprabhu replied, 'Māyāvādī impersonalists are great offenders unto Lord Kṛṣṇa; therefore they simply utter the words brahman, ātmā, and caitanya. The holy name of Kṛṣṇa is not manifest in their mouths because they are offenders unto Kṛṣṇa, the Supreme Personality of Godhead, who is identical with His holy name. The Lord's holy name, His form, and His personality are all one and the same. There is no difference between them. Since all of them are absolute, they are transcendentally blissful. There is no difference between Kṛṣṇa's body and Himself or between His name and Himself. As far as the conditioned soul is concerned, everything is different. One's name is different from the body, from one's original form and so on. The holy name of Kṛṣṇa, His body, and His pastimes cannot be understood by blunt material senses. They are manifest independently. The holy name of Kṛṣṇa, His transcendental qualities and pastimes, as well as Lord Kṛṣṇa Himself are all equal. They are all spiritual and full of bliss.