This is the instruction in the Vedic literature, that the people in this material world, they are very, very busy. Not only men—even the animals, even the birds, beasts, insect. We see on the beach, there are so many dogs, and they are assembled there for sex. So this is the material world, indriya-prīti. Therefore śāstra says that human life should be, consider... They should think, "Whether we shall spoil our life simply by sense gratification, or there is some other business?" Yes, there is some other business. That is tapasya. That is tapasya means we should restrict sense gratification. Sense gratification, either regulated or nonregulated, is meant for animal life. Sense control is the human life. Therefore you'll find in Vedic culture big, big learned scholars, big, big kings, they dedicated their life for tapasya. Tapo divyaṁ putrakā yena śuddhyet sattvam (SB 5.5.1). If you want to purify your existence, then you must take to the process of tapasya. Tapo divyam.
And what is that tapasya? Tapasya for realization of God. And then we shall be purified. What is meaning of purify, purification? Purification means we are eternal, and if we become purified from this material contaminating, then we get back our eternal life, back to home, back to Godhead. That is required. That is... For that we have to accept little tapasya. Not to become sense gratifier like the dogs and hogs. That is not civilization. Nāyaṁ deho deha-bhājāṁ nṛloke kaṣṭān kāmān arhate viḍ-bhujāṁ ye (SB 5.5.1). This human life should be regulated in such a way that he hasn't got to satisfy the senses after taking so much hard labor. The modern civilization is like that. Everyone is engaged in hard labor simply for satisfaction of the senses. So they have become mad. Nūnaṁ pramattaḥ kurute vi... And they are acting without any consideration of the effect. They do not consider whether it is sinful or not. They do not believe in the next life. They do not discriminate what is sinful, what is pious—nothing. Exactly like animals.