That yoga system, kṛṣṇa-yoga system, is described in this Bhagavad-gītā, Seventh Chapter: mayy āsakta-manāḥ pārtha yogaṁ yuñjan mad-āśrayaḥ, asaṁśayaṁ samagraṁ mām (BG 7.1). Asaṁśayam, "Without any doubt." In any other process, you cannot understand what is God in full sense. That is not possible. By speculating process . . . there are so many speculators, theosophist, theologist, philosopher, Māyāvādī. They are speculating about God by . . . but that, by that process, by speculative process, you cannot understand God. That is not possible. Panthās tu . . . it is stated in the Brahma-saṁhitā:
- panthās tu koṭi-śata-vatsara-sampragamyo
- vāyor athāpi manaso muni-puṅgavānām
- so 'py asti yat prapada-sīmny avicintya-tattve . . .
- (Bs. 5.34)
If you want to know Kṛṣṇa, or God, by the speculative process, not only for one year, two year . . . panthās tu koṭi-śata-vatsara-sampragamyo vāyor athāpi. Not mental speculation, but on the aeroplane running on the speed of vāyu, or air, or mind, the speed of mind—still, by traversing many crores of years, you cannot reach. Still it . . . it remains avicintya, inconceivable. But if you take to the process of this kṛṣṇa-yoga, or bhakti-yoga, then you can become aware of Kṛṣṇa very easily.