People have no preliminary knowledge even. Everyone is thinking, "I am this body." "I am Indian," "I am American," "I am Hindu," "I am Muslim," "I am brāhmaṇa," "I am kṣatriya." It is not this body I am. I am put into this body under certain circumstances. Otherwise I am not this body.
So this realization can be possible by yoga practice, mystic yoga. So there are many yogis. Generally, the haṭha-yogīs or aṣṭāṅga-yogīs who try to understand himself by mystic yoga process... But this has been summarized in the Bhagavad-gītā at the end of the Sixth Chapter. I am just trying to read from the Seventh Chapter. So at the end of the Sixth Chapter, Bhagavān says, yoginām api sarveṣām: "There are many yogis. So out of all the yogis..." Yoginām api sarveṣām (BG 6.47). Sarveṣām means "of all." There are different yogis. Yoginām api sarveṣāṁ mad-gata, mad-gatenāntar-ātmanā. The yogic practice is to meditate upon the Supreme Personality of Godhead Viṣṇu within the heart. Dhyānāvasthita-tad-gatena manasā paśyanti yaṁ yoginaḥ (SB 12.13.1). Those who are yogis, they see the Paramātmā. The Paramātmā is in everyone's heart. So they want to find out where is Paramātmā within the heart. This is sum and substance of yoga system.
So yoga means connecting link. We are... Our link is now separated. Somehow or other, we are thinking separate from God. But actually that is not the fact. We are interlinked always with God, with Kṛṣṇa. But some way or other, there is some difficulty. That is called māyā. Just like we are living under the sunshine always. At night there is some difficulty to see the sun, but sun is there, and I am also here. That's a fact. Everyone knows. Now, the earthly planet has turned around. The sun is on the back side of this earth. It is in America now. So sun is there, the American people are seeing sun, but on account of the different position of this earth we cannot see the sun. That does not mean there is no sun. The sunshine is always existing. It is shadowed by this earthly planet. Similarly when... Our relationship with God or Kṛṣṇa is always existing, but when there is some intervention, māyā, then we think, "There is no God" or "I am God," like that.