Prabhupāda: This is a translation of a Vedic version, ācāryavān puruṣo veda. Ācāryavān, one who has ācārya as his guidance, he is supposed to know everything. Ācāryavān puruṣo veda. That is given there.
Tamāla Kṛṣṇa: "One should not therefore remain in material perplexities but should approach such a teacher. This is the purport of this verse. Who is the man in material perplexities? It is he who does not understand the problems of life. In the Garga Upaniṣad this is described as follows. He is a miserly man who does not solve the problems of life as a human and who thus quits this world like the cats and dogs without understanding the science of self-realization. He is called a miserly man. This human form of life is the most valuable asset for the living entity who can utilize it for solving the problems of life. Therefore one who does not utilize this opportunity is a miser."
Prabhupāda: As a miser does not properly use his asset. Suppose you have got one million dollars, you keep it only, you do not use it properly or you spoil it. Then you are called miser. But if you utilize it properly and gain out of it, then you are intelligent. Similarly, Garga Upaniṣad says, he makes distinction, two classes. One class of men he says kṛpaṇa. Kṛpaṇa means miser. And another class of men he says brāhmaṇa, brāhmaṇas. So he classifies, etad viditvāsmāt ya praiti sa brāhmaṇaḥ. This self-realization process... We shall die. It is sure. Every one of us, we'll die. But we should not die like cats and dogs. That is the difference. We may die. We must die. Nobody can escape death, but before death we must know what is self and self-realization. They are brāhmaṇas. Those who are trying to understand what he is, what is his relation with God and how he should live, they are called brāhmaṇas. And those who are living like cats and dogs, simply eating, sleeping, mating and dying, so they are dying like cats and dogs. So death is inevitable. That is also advised by Prahlāda Mahārāja in his instruction to his class fellows. Kaumāra ācaret prājño dharmān bhāgavatān iha (SB 7.6.1). "My dear friends, from this beginning of life... We are now five years old. From this life we should try to understand bhāgavata-dharma." Bhāgavata-dharma means to understand our relationship with the Supreme Lord.