At the present moment, there is no education of the understanding of spiritual life. Everyone is interested with this material body only. Nobody is educated, neither interested in the spiritual life. But unless you take interest in spiritual life, our this material condition of miserable life will continue. The miserable conditions of material life have been pointed out by Śrī Kṛṣṇa in the Bhagavad-gītā. Kṛṣṇa says that the problem of life is janma-mṛtyu-jarā-vyādhi (BG 13.9), meaning that death . . . birth, death, old age and disease, these are our problems. So long we are materially attached, we have to accept a type of body according to our resultant action of activities. There are 8,400,000 species of body, and after death, we have to accept one of the bodies. In the Bhagavad-gītā it is said, tathā dehāntara-prāptiḥ (BG 2.13): we have to accept another body. We do not know what kind of body we are going to accept again, but you can accept one of the bodies as you select. That selection must be made in this life.
In the Bhagavad-gītā it is said that if you like, you can go to the heavenly planet, higher planetary system. Yānti deva-vratā devān (BG 9.25). In the higher planetary system, you get more, I mean to say, elevated standard of life. You can live there for millions of years, and there is better facilities for sense enjoyment. But anywhere you go within this material world, you cannot avoid the four principles, namely birth, death, old age and disease. The birth, death, old age and disease are the inconveniences of the body. The spirit soul has no birth, no death, no old age and no disease, neither the spirit soul is annihilated after the destruction of this body.