Indian man: Could I ask a question?
Prabhupāda: Yes.
Indian man: Is there a basic conflict between a spiritual life and material living? How does the philosophy...?
Prabhupāda: No. Material life means eating, sleeping, mating and defending. This is material life. And spiritual life means something more than this. Just like animal life or human life. Animal life, the common formula is eating, sleeping, mating and defending. A dog also eats; a man also eats. A man also sleeps, and a dog also sleeps. The man also have sex life, and the dog also have sex life. The dog also defends in his own way, and man also defends in his own way, maybe atomic bomb. That is a different thing. But the defense, defense measure... These four principles are common between human being and animal. So advancement of these four principles is not human civilization. That is animal civilization. That is not human civilization. And human civilization means that athāto brahma jijñāsā, the Vedānta-sūtra says. The Vedānta-sūtra, first aphorism is athāto brahma jijñāsā: "Now it is the time for inquiry about the Brahman." That is human life. Without this inquiry, that is animal life. So that is material life and... So long one is not spiritually inquisitive, jijñāsu śreya uttamam, he is animal because he has got only these four principles: eating, sleeping, mating and defending. That's all. He must be inquisitive, "What I am? Why I am put into these miseries of life—birth, death, old, disease? Is there any remedy?" These things should be questioned. Then it is human life. Then it is spiritual life. Athāto brahma jijñāsā. This is the beginning of Vedānta. Brahma-jijñāsā: One should be inquisitive to understand what is Brahman. That is spiritual life.
So our Vedic system was so nicely designed that automatically one will be elevated to the understanding of Brahman. This caste system is condemned because they have been vitiated by designing person. Actually, caste system, as it is stated in the Bhagavad-gītā, cātur-varṇyaṁ mayā sṛṣṭaṁ guṇa-karma-vibhāgaśaḥ... (BG 4.13). According to division of qualities, there are caste system everywhere. Goodness, passion, and ignorance—these three qualities are working in the material nature. The persons who are in goodness, they are called brāhmaṇas. Not that birth. Kṛṣṇa does not say, "By birth." Cātur-varṇyaṁ mayā sṛṣṭaṁ guṇa-karma-vibhāgaśaḥ. There is no question of birth. Simply by quality. Quality, the division is everywhere: intelligent class of men, administrative class of men, productive class of men, and laborer class of men. This is brāhmaṇa, śūdra... That's all. So everything should be taken scientifically. Human... That is human civilization, human life; otherwise animal life. Spiritual life means human life, and material life means animal life. That's all. So we have to make adjustment, as it is recommended in the Bhagavad-gītā, yuktāhāra-vihārasya. It does not mean because I am going to be spiritual man, I shall give up eating. No, not that. But my eating should be adjusted. These things are described in the Bhagavad-gītā, what class of foodstuff is first class, in goodness, and what class of foodstuff in the passion, third class, in ignorance. So we have to raise ourself in the goodness platform of human civilization, then revive our transcendental consciousness or Kṛṣṇa consciousness. These things are, everything is there in the śāstras. Unfortunately, we do not consult.