“Daniel, you are a man who is highly precious. Consider carefully the words that I am about to say to you. Stand up, for I have now been sent to you.”
And when he had said this to me, I stood up trembling.
“Do not be afraid, Daniel,” he said, “for from the first day that you purposed to understand and to humble yourself before your God, your words were heard, and I have come in response to them. However, the prince of the kingdom of Persia opposed me for twenty-one days. Then Michael, one of the chief princes, came to help me, for I had been left there with the kings of Persia..."
The Bible is a comprehensive history and guide designed for man/woman. But occasionally, it intersects with another class of created being - angels - as it does here in Daniel. Angels are not something humans graduate to upon death. They were created for and operate in the spiritual realm, but they can affect the physical realm. As opposed to humans who were created for and can only operate in the physical realm. We can't influence their behaviour but they have influence over our well being. They have a hierarchy and they are described as "ministering spirits" (Heb 1:14). We also know from Scripture, that a portion of these created beings rebelled and went their own way. This happened at some point before Genesis 3. And that their activity is restricted - for God's ultimate purpose (Book of Job).
Just as is the case with humans, those that have rebelled have been allotted a period of time to exert their influence. We can't "see" that influence, but we can see the effects of their influence on the affairs of individual humans and even entire nations. It can manifest itself in the twisted logic of despots or in the blind hatred or fanaticism that can engulf entire nations.
As a condition of salvation, our Father promises a Comforter, Helper, Teacher - the Holy Spirit - to "bear witness with our spirit" or influence our thoughts and behaviours to become more like His Son. As opposed to those spirit beings that rebelled and also try to influence our thoughts and behaviours.
Paul, in his letter to the Ephesians, needed to remind believers in his day that:
"our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms." - Eph 6:12
But a time is coming when the Lord will return to judge and restore (Acts 3:21).
"Your kingdom come..."