How? Now, andhā yathāndhair upanīyamānāḥ: "Just like one blind man is leading several other blind men." That's all. He is the leader. A blind man has become the leader of several other blind man. So what benefit is there? If the man is blind, how can he... Because blind... Why blind? Andhā yathāndhair upanīyamānās te 'pīśa-tantryām uru-dāmni baddhāḥ (SB 7.5.31). Īśa-tantra, īśa-tantra means by the laws of God or by the laws of nature, they are bound up tight, hands and feet, and they are trying to get free from the control of the nature.
So this struggle for existence is going on because they do not know that their self-interest lies in the understanding of his relationship with the Supreme Lord. And that is also confirmed in the Bhagavad-gītā, bahūnāṁ janmanām ante jñānavān māṁ prapadyate: (BG 7.19) "After many, many births, when a man is actually in full knowledge, he surrenders unto Me," the Lord says. That is the ultimate interest. That is the ultimate knowledge, that one should understand his relationship with Viṣṇu and surrender there. That is... Bahūnāṁ janmanām ante: (BG 7.19) "After many, many births," jñānavān, "who has actually acquired knowledge, he surrenders unto Me," the Lord says.