Because we have got the circumstances, unclean body, because we have got unclean body, therefore there is birth and death. Just like as soon as you are infected, there is fever, similarly, the birth and death is a kind of disease. It is also listed with disease. Janma-mṛtyu-jarā-vyādhi (BG 13.9). They are on the same category: birth, death, old age and disease. They are on the same category. But we take care of two things, namely old age . . . we try to remain young by cosmetic, but that is not possible. Similarly, we want to live forever. The lady doctor was, "Yes, we can extend little more." Then what? After all, you have to die. Extend little more or little less, you cannot avoid death.
So this birth, death, old age, disease, this is due to this unclean, infected, material body. That we are not concerned, that how to stop this infected material body, how to revive our original spiritual body. That spiritual body is within, but we have no information. Therefore it is said, alpa-buddhayaḥ. The real life is within. We don't take care. Who is taking care of the spiritual . . . where is the university? Where is the college? Where is this training is given that "We are spirit soul. This body is temporary, and the spirit soul business is this, so that spirit soul may be purified, no more he accepts this material body"? Where is that education? Therefore alpa-buddhayaḥ: less intelligent. They are simply busy with these bodily necessities of life. There is no education of the real living force.
That education you will get—this Kṛṣṇa consciousness movement. Therefore it is unique. It is the education to get people of the human society liberated from the animalistic ignorance. Because those who are under the impression of this bodily concept of life, sa eva go-kharaḥ: they are no better than the asses and the cows.