So how we can understand Bhagavān's energy, how we can understand His creative energy, and what is the potency of Bhagavān, how He is doing that, everything—that is also a great science. That is called Kṛṣṇa science. Kṛṣṇa-tattva-jñāna. Yei kṛṣṇa-tattva-vettā, sei guru haya (CC Madhya 8.128). Caitanya Mahāprabhu says that who is guru. Guru means yei kṛṣṇa-tattva-vettā sei guru haya: "Anyone who knows Kṛṣṇa, he is guru." Guru cannot be manufactured. Anyone who knows about Kṛṣṇa as far as possible... We cannot know. We cannot know Kṛṣṇa cent percent. That is not possible. Kṛṣṇa's energies are so multi. Parāsya śaktir vividhaiva śrūyate (CC Madhya 13.65, purport). One energy is working in one way, another energy is working another way. But they are all Kṛṣṇa's energy. Parāsya śaktir vividhaiva śrūyate. Mayādhyakṣeṇa prakṛtiḥ sūyate sa-carācaram (BG 9.10). The prakṛti... We see this flower is coming out of the nature, and not only flower, so many things are coming out—through the seed. The rose seed, there will be rose tree. Bela seed, there will be bela tree. So how it is happening? The same ground, the same water, and seed also looks like the same, but it is coming out differently. How it is possible? That is called parāsya śaktir vividhaiva śrūyate svābhāvikī jñāna. The ordinary man or the so-called scientist, they say, "It is nature producing." But they do not know what is nature, who is supervising the natural activities, the material nature, how it is working.
That is said in the Bhagavad-gītā, mayādhyakṣeṇa (BG 9.10). Kṛṣṇa says, "Under My superintendence the nature is working." That is the fact. Nature, the matter... Matter cannot combine together automatically. These skyscraper buildings, they are created with matter, but the matter has not come to become skyscraper building automatically. That is not possible. There is a small, tiny spirit soul, the engineer or the architect, who takes the matter and decorate it and creates a skyscraper building. That is our experience. So how we can say that the matter is working automatically? Matter does not work automatically. It requires higher brain, higher manipulation, therefore higher order. Just like in this material world we have got the highest order, the sun, movement of the sun, the heat energy, light energy of the sun. So how it is being utilized? That is stated in the śāstra: yasyājñayā bhramati sambhṛta-kāla-cakro govindam ādi-puruṣaṁ tam ahaṁ bhajāmi **. This sun planet is also a planet like this planet. As in this planet there may be many presidents, but formerly there was one president only, so similarly, in each planet there is a president. In the sun planet we receive this knowledge from Bhagavad-gītā. Kṛṣṇa says, imaṁ vivasvate yogaṁ proktavān aham avyayam: (BG 4.1) "I first of all spoke this science of Bhagavad-gītā to Vivasvān." Vivasvān means the president of the sun globe, and his son is Manu. This is the time. This time is going on. It is called Vaivasvata Manu period. Vaivasvata means from Vivasvān, the son of Vivasvān. He is called Vaivasvata Manu.