Human eyes cannot see into the spirit world. God is a Spirit (John 4:24). Angels are spirits (Heb. 1:13-14). Satan's kingdom is organized into four levels of spirit rebels (Eph. 6:12), and every man is a tripartite creation of a body, a soul, and a spirit, or, as some teach, a spirit with a soul living in a body (I Thess. 5:23).
In the time of Adam and Eve, God entered the Garden of Eden and communicated directly with man by walking through the garden in the cool of the day (Gen 3:8). In the Spirit. Adam and Eve could see and hear God clearly. After they fell into sin, "the eyes of both of them were opened," and they saw they were naked and felt shame (Gen. 3:7). Although their eyes were opened, at the same time their eyes were veiled. From that moment forward, angelic visitors appeared in the form of a vision, a dream, or would take upon themselves human form, just as the two angelic messengers did when instructed by the Almighty to investigate the sins of Sodom. (See Genesis 19). Even the writers of Hebrews wrote to be careful when entertaining a stranger because you might not be aware that it is an angel (Hebrews 13:2).
If our eyes could be opened and the veil lifted, we would continually see angels, demonic entities, and other forms of spirit beings. While some may wish to see into the invisible realm, the fact is that when great men of God and Hebrew prophets have pierced this veil and seen, for example, angels in their full glory, the reactions have normally been to fall down and be gripped with an overwhelming feeling of fear. Abraham fell into a deep trance (Gen. 15:12) and fell on his face when God talked to him (Gen. 17:3, 17). Ezekiel describes seeing the Almighty upon His throne, with cherubim and amazing heavenly beings appearing like wheels spinning within wheels (Ezek. 1), and he too fell upon his face. In several instances when a vision of God or the angelic realm manifested, the prophet fell down upon his face. Daniel described an angelic visitor with brass-colored arms and feet, white hair, a gold belt, and eyes like fire. His reaction was so visibly powerful that even the men with him who did not see the vision became overwhelmed and began "quaking" and fled, hiding themselves (Dan. 10:5-7). Daniel found himself on his face with no strength remaining in his body. When John saw the resurrected Christ in heaven, he "fell at His feet as dead" (Rev. 1:17). Even Balaam's donkey fell down when he saw an angel of the Lord (Numbers 22:27)!
When the veil is lifted and a mere mortal taps into not just a vision or dream, but into the actual unseen world of angels, demons, heaven, or hell, the human body is unable to sustain the glory of the heavenly realm without responding in some like manner. If we could live with our spiritual eyes continually opened, we would never get any work done and would be continually disrupted in our sleep.
Scripture instructs believers to "walk by faith, not by sight (II Corinthians 5:7). I cannot physically see God, but I believe in God because of the Bible's evidence and because I have faith that undergirds my confidence in the Word. With my human eyes I am unable to spot an angel flying through the heavens or a cosmic conflict between warring angels and prince spirits called the "spiritual hosts of wickedness in the heavenly places" (Eph. 6:12). However, because my inner being is also a "spirit." I can at times sense or feel the presence of the Lord, the warmth and peace of an angel, or the dark oppressive wicked spirits that are in my earth zone. To pierce the curtain of the unseen, a believer must be in tune to that particular realm of spiritual activity.
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