The Bible tell us concerning the truth of both the physical world, which is the natural living space of human beings, and a spiritual world that is governed and constrained by the Almighty God. Despite the fact that God made humanity and gave us access to the spiritual realm for us to fellowshipping with Him, we lost that privilege when Adam and Eve sinned.
Notwithstanding, the moment someone becomes born again, the key to the reality of the spirit is promptly reestablished. Unconverted souls remain forever separated from the heavenly realm.
The spiritual world is especially just about as genuine as the physical world, yet just the people who approach it can see the sights, hear the sounds and even partake in the activities of heaven.
Living in the spirit requires faith and just as the eye produces feeling about the truth of articles in the physical world, so does faith produce similar conviction about things in the realm of the spirit, which can not be seen with our eye. Faith show itself by producing the confirmation that what we hope will happen.
It also gives knowledge to the reality of things in the world that can not be seen. These unseen realities from God give a reliable power for daily living to every man and woman of faith.
Faith sees the unseen, believes the unbelievable and gets the impossible and this is the testimony of every diligent child of God who has one lived on this earth, like Abraham, Moses, the prophets and the apostles. They all saw things that others couldn't see and they had faith in them until they were manifested physically.