A civilization that does not consider the progressive advancement of the immortal soul merely fosters a bestial life of ignorance
Each and every planet has its particular atmosphere, and if one wants to travel to any particular planet within the material universe, one has to adapt his material body to the climatic condition of that planet. For instance, if one wants to go from India to Europe, where the climatic condition is different, one has to change his dress accordingly. Similarly, a complete change of body is necessary if one wants to go to the transcendental planets of Vaikuṇṭha. However, if one wants to go to the higher material planets, he can keep his finer dress of mind, intelligence and ego, but has to leave his gross dress (body) made of earth, water, fire, etc.
When one goes to a transcendental planet, it is necessary to change both the finer and gross bodies, for one has to reach the spiritual sky completely in a spiritual form. This change of dress will take place automatically at the time of death if one so desires.
The Bhagavad-gītā confirms that one will attain his next material body according to his desires at the time he leaves his body. The desire of the mind carries the soul to a suitable atmosphere as the wind carries aromas from one place to another. Unfortunately, those who are not yogīs but gross materialists, who throughout their lives indulge in sense gratification, are puzzled by the disarrangement of the bodily and mental condition at the time of death. Such gross sensualists, encumbered by the main ideas, desires and associations of the lives they have led, desire something against their interest and thus foolishly take on new bodies that perpetuate their material miseries.
Systematic training of the mind and intelligence is therefore needed so that at the time of death one may consciously desire a suitable body, either on this planet or another material planet or even a transcendental planet. A civilization that does not consider the progressive advancement of the immortal soul merely fosters a bestial life of ignorance.
It is foolish to think that every soul that passes away goes to the same place. Either the soul goes to a place he desires at the time of death, or upon leaving his body he is forced to accept a position according to his acts in his previous life. The difference between the materialist and the yogī is that a materialist cannot determine his next body, whereas a yogī can consciously attain a suitable body for enjoyment in the higher planets. Throughout his life, the gross materialist who is constantly after sense gratification spends all day earning his livelihood to maintain his family, and at night he wastes his energy in sex enjoyment or else goes to sleep thinking about all he has done in the daytime. That is the monotonous life of the materialist. Although differently graded as businessmen, lawyers, politicians, professors, judges, coolies, pickpockets, laborers and so on, materialists all simply engage in eating, sleeping, fearing and sense gratification and thus spoil their valuable lives pursuing luxury and neglecting to perfect their lives through spiritual realization.