Material World vs. Spirit World
Light has no mass but could generate energy as E = MC^2 according to Einstein's theory in modern physics (E: energy; M: mass; c: light velocity).The human body is made of mass and can produce various energy with its parts with specific mass. And according to work of the mind, the fingers, hands, etc. of the human body can move based on energy produced by the work of the mind, while the mind has no mass like light.
However, the modern science cannot identify or explain what the true origin of the mind is in terms of material aspects such as mass.
From a point of view in the universal scale, it is believed that materials such as elemental particles and other components of atoms with mass were made of light without mass in an environment with very high energy.
Put simply, this material universe where we live was created from light without mass and primordial universal energy. And a human being is made of the mind without mass and the material body consisting of atoms.
The key to understanding the material universe and the human mind is realizing that energy and force beyond this material world exist and work. Indeed, light is the key element in this material universe and had no mass. The human mind is the key element in a human being and has no mass. And, what has no mass should come from the spirit world. Put clearly, this material universe and our minds should have been created from the spirit world.
That is why the modern material science cannot identify and explain how this material universe was materially created. In addition, the modern science of psychology and other natural science cannot identify and explain how the human mind was created and works.
Indeed, it is natural that the spirit world and the spiritual energy/force cannot be identified and elucidated with material science. Truly, even if we cannot fully elucidate the origin of the material universe from a point of scientific view, it really exists; even if we cannot fully elucidate what our minds are and how they work in terms of scientific aspects, they exist and work. What cannot be fully scientifically explained and elucidated can exist and work. But, if we admitted the spirit world, we should be able to accept the fact that the material universe and our minds (souls) were created from the spiritual energy to content ourselves.
Finally, we have to admit that this material universe was created from the spirit world and our minds (souls) were created from the spiritual energy.
So, it is natural to think and believe that our minds (souls) should enter into the spirit world (the afterlife) after death of our bodies in the earth, a tiny part of this material universe.
Based on this notion, we have to read the Bible and interpret the words and the teachings of the Lord Jesus Christ.
It should be blessing if you could see various spirits in this material world, but the Lord Jesus Chris meant that it was more blessing if you could have faith in the God without seeing them.
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Mark 6, King James Version
2 And when the sabbath day was come, he began to teach in the synagogue: and many hearing him were astonished, saying, From whence hath this man these things? and what wisdom is this which is given unto him, that even such mighty works are wrought by his hands?
3 Is not this the carpenter, the son of Mary, the brother of James, and Joses, and of Juda, and Simon? and are not his sisters here with us? And they were offended at him.
4 But Jesus, said unto them, A prophet is not without honour, but in his own country, and among his own kin, and in his own house.
5 And he could there do no mighty work, save that he laid his hands upon a few sick folk, and healed them.
6 And he marvelled because of their unbelief. And he went round about the villages, teaching.