Perfect knowledge comes through concentrating the mind on Krishna alone, automatically revealing everything.Listen — Srila Prabhupada Uvaca
Bhagavad-gītā 7.1 — February 22, 1969, Los Angeles 690222BG-LOS ANGELES [60:17 Minutes] Bg-07.01_690222BG-LOS ANGELES Prabhupāda: Today we shall begin Seventh Chapter. One hundred and sixty-six. Devotee: Chapter Seven, Page 166. "Knowledge of the Absolute." One: "Now hear, O son of Pṛthā [Arjuna], how by practicing yoga in full consciousness of Me, with mind attached to Me, you can know Me in full, free from doubt." [Bg. 7.1] Purport. Prabhupāda: Arjuna's mother was known as Pṛthā. Pṛthā.
Her father's name was Mahārāja Pṛthu. Therefore Arjuna is known as Pārtha. Sometimes Arjuna is addressed as Pārtha. It comes from the meaning, root meaning, of Arjuna's mother's father, grandfather. Go on. Devotee: Purport: "In the first six chapters of the Bhagavad-gītā, the living entity has been described as nonmaterial spirit soul who is capable of elevating himself to self-realization by different types of yogas.
At the end of the Sixth Chapter it has been clearly stated that the steady concentration of the mind upon Kṛṣṇa, or in other words, Kṛṣṇa consciousness, is the highest form of all yoga. By concentrating one's mind upon Kṛṣṇa one is able to know the Absolute Truth completely, but not otherwise. The impersonal brahma-jyotir, or localized Paramātmā, is not perfect knowledge of the Absolute Truth, because it is partial." Prabhupāda: Yes. Impersonal...
Just like sunshine and the sun disc and the inhabitants of the sun globe. In one sense, they are one unit. You cannot separate sunshine from the sun disc or the sun disc from the inhabitants or the predominating deity of sun planet. They are all in light, but still there is difference.
Sunshine is coming within your room. Although the sun disc and the sunshine is not different, still, when you realize what is sunshine, that does not mean you realize what is the sun disc. This is very practical. To understand what is sunshine does not mean to understand what is sun disc. You can have some idea: "The sun disc is also light, and it has got heat; it is illuminating." These ideas you can get, but not exactly what is the temperature of that sun disc, how you can live there.
There are so many things to learn. Therefore, impersonal Brahman, understanding of impersonal Brahman, is not perfect knowledge. Exactly... Knowledge of sunshine is not perfect knowledge of sun. That you can understand very easily.
Suppose daily you are having sunshine within your room. Does it mean you know what is sun disc or what is the inhabitants of the sun globe? No. Nobody knows.