In the paramparā system, when the questions are bona fide the answers are bona fide. No one should attempt to create or manufacture answers. One must refer to the śāstras and give answers according to Vedic understanding. The words yathā-śrutam refer to Vedic knowledge. The Vedas are known as śruti because this knowledge is received from authorities. The statements of the Vedas are known as śruti-pramāṇa. One should quote evidence from the śruti—the Vedas or Vedic literature—and then one's statements will be correct. Otherwise one's words will proceed from mental concoction.
(Srimad Bhagavatam-----7:13:23-----purport).

In the human form of life, one should not remain foolish and ignorant, but must inquire about his constitutional position. This is called athāto brahma jijñāsā. The human psychology gives rise to many questions, which various philosophers have considered and answered with various types of philosophy based upon mental concoction. This is not the way of liberation. The Vedic instructions say, tad-vijñānārthaṁ sa gurum evābhigacchet: (MU 1.2.12) to solve the problems of life, one must accept a spiritual master. Tasmād guruṁ prapadyeta jijñāsuḥ śreya uttamam: (S.B.11:3:21) if one is actually serious in inquiring about the solution to material existence, one must approach a bona fide guru.
(Srimad Bhagavatam-----7:7:47-----purport).

O
ne should not be misled by mental concoctions, supposing his material body to be perfect and deeming oneself a sakhī. This is something like ahaṅgrahopāsanā, that is, a Māyāvādī’s worship of his own body as the Supreme. Śrīla Jīva Gosvāmī has cautioned mundaners to abstain from such conceptions. He also warns that thinking oneself one of the associates of the Supreme without following in the footsteps of the gopīs is as offensive as thinking oneself the Supreme. Such thinking is an aparādha. One has to practice living in Vṛndāvana by hearing about the talks of the gopīs with Kṛṣṇa. However, one should not consider himself a gopī, for this is offensive.
(Sri Caitanya Caritamrta-----2:8:204-205-----purport).

Śrī Bhaktisiddhānta Sarasvatī Ṭhākura says that Kṛṣṇa is obtainable for the faithful, but for those who are accustomed to argue, Kṛṣṇa is far, far away. Similarly, these talks between Rāmānanda Rāya and Śrī Caitanya Mahāprabhu can be understood by a person who has firm faith. Those who are not in the disciplic succession, the asauta-panthīs, cannot have faith in these talks. They are always doubting and engaging in mental concoctions. These talks cannot be understood by such whimsical people. Transcendental topics remain far, far away from those engaged in mundane arguments. In this regard, the Vedic mantras in the Kaṭha Upaniṣad (1.2.9) state, naiṣā tarkeṇa matir āpaneyā proktānyenaiva su-jñānāya preṣṭha.
(Sri Caitanya Caritamrta-----2:8:301-----purport).

Knowledge is information gathered from the scriptures, and science is practical realization of that knowledge. Knowledge is scientific when it is gathered from the scriptures through the bona fide spiritual master, but when it is interpreted by speculation, it is mental concoction. By scientifically understanding the scriptural information through the bona fide spiritual master, one learns, by one's own realization, the actual situation of the Supreme Personality of Godhead. The transcendental form of the Supreme Personality of Godhead is different from material manifestations, and it is above the reactions of matter. Unless one scientifically understands the spiritual form of the Personality of Godhead, one becomes an impersonalist. The sunshine in itself is illumination, but that illumination is different from the sun. Yet the sun and the sunshine are not differently situated, for without the sun there can be no sunshine, and without sunshine there is no meaning to the word sun.
(Teachings of Lord Caitanya).

Once a great realized sage was lamenting that the Supreme Lord Kṛṣṇa was living in Dvārakā but that he was unable to take advantage of seeing Him. After thinking this, the sage immediately became stunned. He was thinking that he was simply wasting his time. In other words, the sage lamented because the Supreme Personality of Godhead was personally present but he still could not take advantage of this because of his meditation.
When a mystic is transcendental to all kinds of mental concoctions and is situated in Brahman, his state is called trance, beyond the influence of the material conception of life. In that stage, when one hears about the transcendental pastimes of the Lord, there may be shivering in the body.
(Nectar of Devotion).

"The luminous planets like the sun, moon or stars reflect themselves in different types of reservoirs, like water, oil or ghee. The reflection moves according to the movement of the reservoir. The reflection of the moon is on the water, and the moving water makes the moon also appear to be moving, but actually the moon is not moving. Similarly, by mental concoction the living entity attains different kinds of bodies, although actually he has no connection with such bodies. But on account of illusion, being enchanted by the influence of māyā, the living entity thinks that he belongs to a particular type of body. That is the way of conditioned life. Suppose a living entity is now in a human form of body. He thinks that he belongs to the human community, or a particular country or particular place. He identifies himself in that way and unnecessarily prepares for another body, which is not required by him. Such desires andmental concoctions are the cause of different types of bodies. The covering influence of material nature is so strong that the living entity is satisfied in whatever body he gets, and he identifies with that body with great pleasure. Therefore, I beg to request you not to be overwhelmed by the dictation of your mind and body."
(Krsna Book).

Only one who renders devotional service to the Lord can attain this stage of indifference to the false and temporary assets of material nature. Such devotional service is not a mental concoction of depraved persons but is an actual process of God realization characterized by full cognizance and detachment and based on the Vedic literature. So-called devotional practices that have no reference to the rules and regulations set down in such books of Vedic literature as the śruti, the smṛti, the Purāṇas, and the Pañcarātras are not bona fide. The self-realized souls advise us to reject such pseudodevotional practices, which simply create a disturbance on the path of spiritual realization. Only by sincerely engaging in the service of the Lord according to the injunctions of scripture can one gradually become a qualified devotee of the Lord, and it does not matter whether it takes many repetitions of birth and death, life after life.
(Mukunda-Mala-Stotra).

Lord Kṛṣṇa is worshiped by the gāyatrī mantra, and the specific mantra by which He is worshiped is called kāma-gāyatrī. Vedic literatures explain that that sound vibration which can elevate one from mental concoction is called gāyatrī. The kāma-gāyatrī mantra is composed of 24 1/2 syllables thus:
klīṁ kāma-devāya vidmahe
puṣpa-bāṇāya dhīmahi
tanno 'naṅgaḥ pracodayāt
This kāma-gāyatrī is received from the spiritual master when the disciple is advanced in chanting Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare. In other words, this kāma-gāyatrī mantra and saṁskāra, or reformation of a perfect brāhmaṇa, are offered by the spiritual master when he sees that his disciple is advanced in spiritual knowledge. Even then, the kāma-gāyatrī is not uttered under certain circumstances. In any case, the chanting of Hare Kṛṣṇa is sufficient to elevate one to the highest spiritual platform.
(Teachings of Lord Caitanya).