Text 5]
Attack by Caṇḍavega on the City of Purañjana
1253
thinks that life will go on and that he will simply continue enjoying his senses, but “time and tide wait for no man.” The span of youth expires very quickly. One who wastes his life simply by committing sinful activities in youth immediately becomes disappointed and disillusioned when the brief period of youth is over. The material enjoyments of youth are especially pleasing to a person who has no spiritual training. If one is trained only according to the bodily conception of life, he simply leads a disappointed life because bodily sense enjoyment finishes within forty years or so. After forty years, one simply leads a disillusioned life because he has no spiritual knowledge. For such a person, the expiration of youth occurs in half a moment. Thus King Purañjana’s pleasure, which he took in lying down with his wife, expired very quickly.
Kāma-kaśmala-cetasaḥ  also indicates that unrestricted sense enjoyment is not allowed in the human form of life by the laws of nature. If one enjoys his senses unrestrictedly, he leads a sinful life. The animals do not violate the laws of nature. For example, the sex impulse in animals is very strong during certain months of the year. The lion is very powerful. He is a flesh-eater and is very strong, but he enjoys sex only once in a year. Similarly, according to religious injunctions a man is restricted to enjoy sex only once in a month, after the menstrual period of the wife, and if the wife is pregnant, he is not allowed sex life at all. That is the law for human beings. A man is allowed to keep more than one wife because he cannot enjoy sex when the wife is pregnant. If he wants to enjoy sex at such a time, he may go to another wife who is not pregnant. These are laws mentioned in the  Manu-saṁhitā  and other scriptures.
These laws and scriptures are meant for human beings. As such, if one violates these laws, he becomes sinful. The conclusion is that unrestricted sense enjoyment means sinful activities. Illicit sex is sex that violates the laws given in the scriptures. When one violates the laws of the scriptures, or the  Vedas , he commits sinful activities. One who is engaged in sinful activities cannot change his consciousness. Our real function is to change our consciousness from  kaśmala , sinful consciousness, to  Kṛṣṇa , the supreme pure, as confirmed in  Bhagavad-gītā: paraṁ brahma paraṁ dhāma pavitraṁ paramaṁ bhavān : “You are the Supreme Brahman, the ultimate, the supreme abode and purifier.” (Bg. 10.12)
Kṛṣṇa  is the supreme pure, and if we change our consciousness from material enjoyment to  Kṛṣṇa , we become purified. This is the process recommended by Lord Caitanya Mahāprabhu as the process of  ceto-darpaṇa-mārjanam , cleansing the mirror of the heart.