Devotee: We say that Kṛṣṇa is present within the spiritual, within the heart of the living entity.
Prabhupāda: Kṛṣṇa is present everywhere.
Devotee: As a person or as an energy?
Prabhupāda: In His energy. Also person. person we cannot see with the present eyes, but energy we can feel. Clear this point more and more. So when fully realized, then this verse, that everything is brahma, sarvaṁ khalv idaṁ brahma... The advanced devotee, he does not see anything except Kṛṣṇa.
Devotee: Śrīla Prabhupāda: Is there is actual difference between the material energy and the spiritual energy?
Prabhupāda: Yes, difference, there are many differences. The same example, electricity. So many things are working, difference of energy. Even the dictaphone is working, electricity. By the same energy, electricity. Therefore Kṛṣṇa says ahaṁ sarvasya prabhavaḥ (BG 10.8). He's the origin of everything.
Devotee: It is explained in Bhagavad-gītā that one change body during the lifetime, but we see that a black man never becomes white, or that there is a constant, there is something constant within the body though it changes. What is it? How come this is, changes body but still we can recognize someone from his youth to his old age.
Prabhupāda: So when you further advance you'll find there is no distinction between black and white. Just like a flower is coming out, there are many colors. So it is coming from the same source. As such there is no such difference, but to make it beautiful there are so many colors. In the sunshine there are seven colors, and from that seven colors, multicolors are coming out, origin the one color white, and then so many colors coming. Is that clear or not?
Devotee: Śrīla Prabhupāda, if Kṛṣṇa has created everything and everything is submitted to Kṛṣṇa's will, can we really say what is good or bad?
Prabhupāda: There is no good or bad, it is mental concoction. But on the whole, in the material world means everything bad.