When the sunlight enters within your room through the window, you cannot say: "I have got the sun now. Sun is within my room." That is nonsense. No. Sun is far, far away, but his energy has entered your room. So much you can say. But if you think that because the sunlight is within the room . . . sunlight within your room? Sunlight, if it comes a few millions miles nearer this planet, it will be finished. What about your room? The temperature is so high.
Therefore the Absolute Truth are realized in three phases: Brahman, Paramātmā and Bhagavān. Brahmeti paramātmeti bhagavān iti śabdyate (SB 1.2.11). Śabdyate means we receive from the Vedic literature. Śabda-brahma, śabdyate. By sound vibration, by transcendental sound transmission, we understand that the Absolute Truth is realized in three phases. What is that? Brahmeti paramātmeti bhagavān iti śabdyate.
So what is the difference between Brahman, Paramātmā and Bhagavān? That difference is just like the same. If you study, if you become satisfied, "Now I am in the light, sunshine; finished my business," that is Brahman realization. But that is not final. By Brahman realization you are in the light, that's a fact. You are in illumination, you are in temperature, that's a fact. But if you are satisfied with such temperature and light, then you remain there. And if you are fortunate enough to make further progress, that is Paramātmā—to realize the Supersoul in everyone's heart: in your heart, in my heart, everywhere, all-pervading. Sunshine is also all-pervading. Brahman is also all-pervading. Sarvaṁ khalv idaṁ brahma. Similarly, Paramātmā, the Supersoul, is also all-pervading.