In the Bhagavad-gītā it is very nicely explained in the Thirteenth Chapter, mayā tatam idaṁ sarvam (BG 9.4), "I am expanded all over." Sarvam. Sarva means all over. Avyakta-mūrtinā: "That is My impersonal feature." Kṛṣṇa is everywhere in His impersonal, but still He is person. The Māyāvāda philosophy thinks that "If Kṛṣṇa has become everything, then where is the necessity of Kṛṣṇa again, person?" This is rascaldom, because he is thinking in material way. He has no spiritual knowledge.
Material way . . . suppose if you take a piece of paper and you may make it in particles and throw it all over; the original paper has no existence. This is material. But we get information from the Vedas that pūrṇasya pūrṇam ādāya pūrṇam evāvaśiṣyate (Īśo Invocation). The Absolute Truth is so perfect that if you take the whole perfect, still, the perfect remains. One minus one equal to one, not zero. The material way of thinking is "One minus one equal to zero," but spiritual way is not like that. Spiritual way is "One minus one equal to one. One plus one equal to one." Oneness. This is the conception of oneness.
So Kṛṣṇa is everything. The atheist will say: "Oh, they have installed some wooden forms and they are worshiping as gods." Atheistic. And one who knows the Kṛṣṇa science, he'll understand that "Kṛṣṇa is everything; therefore He can appear in everything." If electricity current is everywhere, so wherever you touch current, you'll feel, "Here is current." Similarly, the Kṛṣṇa current in impersonal form is everywhere. It is the technician who knows how to use that current. That's all.
So . . . just like we get telephonic connection. We simply inform the person, deposit our money. They come immediately. They find out where the connection can be done, and he does his work. We do not know. He knows the technique, how to join telephone wire. Within a few seconds he joins and he, oh, "kling, kling," you are ready.
So one must know how to connect Kṛṣṇa. Kṛṣṇa is everywhere. This is Kṛṣṇa conscious movement. This is Kṛṣṇa consciousness. One must know how we can derive from these features of Kṛṣṇa's forms in wood or iron or metal . . . that doesn't matter. Kṛṣṇa is everywhere. But you have to learn how to contact Kṛṣṇa with everything. That will be explained in this system of yoga. You'll learn it.
So the Kṛṣṇa consciousness is also a yoga, the perfect yoga, the highest of all yogic systems. Anyone, any yogī may come, and we can challenge and we can say that this is the A-1 yoga system. This is A-1, and it is very simple at the same time. You haven't got to exercise your body. Suppose if you are weak or you feel some tiredness, but in Kṛṣṇa consciousness you won't feel.