Practically, a common man, when he goes to the Western country, from the materialistic point of view one sees, "Oh, this is heaven. So many nice motorcars, so many nice roads, so many nice skyscraper building, standard of living so nice, earning money, facility, material happiness." So it may be taken as heaven, although it is a . . . the same planet.
So we can very easily imagine that, from the description of the śāstra, that there are different types of planets and different types of standard of living, different types of knowledge . . . not different types, advancement of knowledge. In this way, the, you go higher and higher.
There are higher planetary system. This is called Bhūrloka. Above this, there is Bhuvarloka. Above that, there is Svargaloka. Above that, there is Janaloka. Above that, there is Mahar, Maharloka, Satyaloka and Brahmaloka. Similarly down, there are different planetary systems. But we living entities, we are traveling according to our desire, according to our plan.
God is (in) everyone's heart. Īśvaraḥ sarva-bhūtānāṁ hṛd-deśe arjuna tiṣṭhati (BG 18.61). God is staying, He's there as Paramātmā. He is so friendly to the living entity. That is, that information we get from Vedic literature, that God and the living entity, both of them are sitting on the same tree. The same tree is this body. So within this body, within the heart, I am sitting there, and God is sitting there also.
So God is simply observing what I am doing, what I am desiring, and He's giving me opportunity, "All right, you want to do this? Do it, and take experience." And the living entity is enjoying. It is compared with the tree, because the living entity's enjoying the fruit of the tree, and the other living entity, Supreme, Paramātmā, He's simply witnessing. Witnessing, and giving you the result of your fruitive activities. That is called karma.
So these things are very subtle matters, and we have got very, very scientific, authorized information of these matters. But people have become so degraded, they do not want to take any information of the soul, of the transmigration of the soul, of God, our relationship with God, what is the ultimate goal of life, why we are put into this miserable condition of life. Janma . . . you may say that, "I am very happy." I may say: "I am very happy." But actually, there is no happiness. How there can be happy, janma happiness?
Janma-mṛtyu-jarā-vyādhi-duḥkha-doṣānudarśanam (BG 13.9). Actually who is in knowledge, he should know, "Where is happiness? I do not wish to die; I am dying. I do not wish to be diseased; I am diseased. I do not wish to become old, I am becoming old. So where is my happiness?" This is called māyā. There is no happiness, but still, he's thinking that he is in happiness. This is called illusion. Daivī hy eṣā guṇamayī mama māyā duratyayā (BG 7.14).
So this is . . . just like the animal is in illusion. A hog is eating stool, but he's thinking that, "I am enjoying, very nice." He's becoming fat. This is called illusion. You are not happy. Nobody's happy in this material world. Therefore the inquiry should be . . . that is the Brahmā-sūtra. That is the Vedānta-sūtra: athāto brahma jijñāsā. Athāto brahma-jijñāsā. This human life is for understanding Brahman. What is that Brahman, Absolute Truth? That is required. If you are simply engaged, animal-like, eating, sleeping, mating, then where is the distinction between animal and us? There is no such distinction.