Every one has some knowledge of what we call the physical realm. It is the world in which we live, and the world that we experience with our five senses. The ancient Greeks believed that everything in this physical realm consisted of some combination of just four elements: earth, water, air and fire. We know now that their ideas were a bit simplistic, but perhaps in time, even our “modern” understanding of the complexities of this realm will prove to be only elementary. There are the worlds of the infinitely large and the infinitely small that are yet, for the most part, veiled in our own ignorance.
But there is another realm more encompassing than the first, and though our physical receptors are not sufficient to explore that realm, it is no less real, no less a part of our present abode. It is called the spiritual realm, and God, who is Lord of both realms, has informed us that though our present awareness is somewhat limited to the physical realm, there is coming a day when we will enjoy the fulness of His creation and His own presence in both realms. But for now, our most comprehensive perception of the unseen must come from the creation (what God has done), and the Word of God (what He has said).
“The heavens declare the glory of God; and the firmament sheweth his handywork. Day unto day uttereth speech, and night unto night sheweth knowledge. There is no speech nor language, where their voice is not heard. (Psalm 19:1–3)” “For the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made, even his eternal power and Godhead; so that they are without excuse: (Romans 1:20)”
“For by him were all things created, that are in heaven, and that are in earth, visible and invisible, whether they be thrones, or dominions, or principalities, or powers: all things were created by him, and for him: (Colossians 1:16)” “For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places. (Ephesians 6:12)” God is a Spirit: and they that worship him must worship him in spirit and in truth. (John 4:24)