2 Kings 6:15-17 (NKJV)
And when the servant of the man of God arose early and went out, there was an army, surrounding the city with horses and chariots. And his servant said to him, "Alas, my master! What shall we do?"
So he answered, "Do not fear, for those who are with us are more than those who are with them." And Elisha prayed, and said, "Lord, I pray, open his eyes that he may see." Then the Lord opened the eyes of the young man, and he saw. And behold, the mountain was full of horses and chariots of fire all around Elisha.
A large Syrian army had surrounded the city by night to attack where Elisha and his servant were staying. The servant saw this army the next morning and in distress went to wake Elisha to tell him about it. Elisha, the Prophet of God told his servant not to worry about it indicating that God has everything under control. I can imagine the servant saying "Yes I know God will be with us but you don't understand, this is a real army with guns and tanks right outside!" Elisha calmly prays to God to allow the servant to get a glimpse of what the true "reality" was. The armies of Syria were themselves surround by an invisible but vast army of the hosts of heaven on horses and chariots of fire!
If we could only see behind the veil ourselves, what a different attitude we might have about the invisible realm that is all about us. There is more to this world that what meets the eye.