Krishna reveals Himself only through pure devotional service, not through any amount of intellectual or yogic searching.Listen — Srila Prabhupada Uvaca
Arrival Address at Bhaktivedanta Manor — July 7, 1973, London 730707AR-LONDON [11:29 Minutes] Arrival_730707AR-LONDON Prabhupāda: ...given the facility of assembling in this nice house, this good boy George Harrison. We must give him all glories. We must be thankful to him that he has given us the facility, and Kṛṣṇa will bless him more and more. So far Gopījana-vallabha, Rādhā-Mādhava, our simple worshipable Supreme Personality of Godhead, Rādhā-Mādhava, He is always enjoying in company with Śrīmatī Rādhārāṇī, Rādhā-Mādhava.
He does not go outside Vṛndāvana. Kṛṣṇa, original Kṛṣṇa, He does not go even a step out of Vṛndāvana leaving aside the gopīs. Vṛndāvanaṁ parityajya na padam evaṁ kutra gacchati. He does not go anywhere.
So people are making research to find out God. In the Brahma-saṁhitā it is said, panthās tu koṭi-śata-vatsara-sampragamyo vāyor athāpi manaso muni-puṅgavānām so 'py asti yat-prapada-sīmny avicintya-tattve govindam ādi-puruṣaṁ tam ahaṁ bhajāmi [Bs. 5.34] Govinda, panthās tu koṭi-śata-vatsara-sampragamyaḥ. Those who are searching after God... Those who are not searching, they are useless.
Those who are searching, jñānī, jijñāsu, so they are searching after God, but if they try to approach God, panthās tu koṭi-śata-vatsara, by... Just like airplane. I have come here within twelve hours, from Calcutta to London. So not this airplane, but panthās tu koṭi-śata-vatsara-sampra..., vāyor athāpi.
Vāyu. If... This airplane is floating on the air, but if the air becomes aeroplane itself or the mind becomes... You know the speed of mind. You can go on the mind millions of miles within a second.
That science has not yet discovered, how to go in the speed of mind. The yogīs know. The perfect yogīs, they can travel on the speed of mind. That is also material science.
So even on the speed of mind or on the speed of the velocity of the air, if you try to go to approach God, find out where is God... And the time? Panthās tu koṭi-śata-vatsara [Bs. 5.34]. Not one day, two day or one hour, two hour, but many millions of years, koṭi-śata-vatsara.