Material Body vs. Spirit
The human body is all made of cells. A cell is made of molecules and atoms. Physically or materially, there is nothing else in human bodies.
But, each mass of cells or molecules and atoms, that is, a human body, has a mind and a heart. And its brain functions to generate self consciousness or sense of self. And, the mind works to make a man live not only in the material world but also in the spiritual world.
Although no matter what a man thinks in his brain in the spiritual world, its results are linked to the material world, a man's mind is linked to the spiritual world where Heaven and the hell exist.
So, human beings are entities that are shifting from the material world to the spiritual world by their work in their minds. Therefore, we have to think about the spiritual world more. And, the teaching of Christ Jesus is intended to guide human beings correctly through this path from the material world to the spiritual world and eventually to Heaven.
Indeed, Christ Jesus said that God is spirit. And spirit is coming down from Heaven into the mind of a person. It also means that human minds can sense spiritual entities. Traditionally, human beings assumed that there exist some spiritual entities that are not fixed in material bodies. Those entities have been also called ghosts that have no material bodies but possess spiritual minds that work like human minds.
The human minds can sense the spiritual world, but if a man becomes greedy and always tries to satisfy his material desire, he will lose the ability to sense the spiritual world or receive an influence from Heaven.
And the degree of how much one is materialistic and far from an influence of the Heaven can be measured by how rich he is. Because money and wealth are used to satisfy owners' material desire. The more one enjoys riches, the less one can be influenced by Heaven.
That is why rich men must not be leaders in a community, a society, and a nation. But in reality, poor men cannot be a prime minister, a president, or a king in the human world. So, that is why this world is always full of problems, troubles, tragedies, conflicts, and wars.
It also tells why financial, monetary, and economic policies cannot be solutions in the world.
But can all the men abandon all of their material desires and live under influence of Heaven as God wishes? Probably no. Therefor souls of most of men go to the hell when their souls are separated from their physical bodies after their death.
Human beings are made of molecules and atoms that are material parts. But, they are given spirit to their minds by Heaven. While they are living, they develop their souls which are spiritual. After their death, souls are separated from the material bodies. And there are only two places for the souls to go: Heaven and the hell.
When material civilization was not so developed 100 years ago, 1000 years ago, or 2000 years ago, people had more time to think about spiritual matters. But modern people busy manipulating smart phones have less time to think about the spiritual things. And people who do not have enough contact to the spiritual world might do any evil things to satisfy their desire.
If science and technology continue to evolve more rapidly in future, human beings without enough faith in God might do very terrible things to themselves using advanced scientific knowledge. One of advanced products based on advanced science is nuclear weapons. And another may be gene engineering.
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Mat 5:29 And if thy right eye offend thee, pluck it out, and cast it from thee: for it is profitable for thee that one of thy members should perish, and not that thy whole body should be cast into hell.