Ephesians 6:12 For we wrestle not against flesh and blood...
In various places in the Bible we catch glimpses of the unseen spiritual realm. A good example of this is found in 2 Kings 6 when the King of Syria send soldiers to capture Elisha and his servant.
2 Kings 6:14-17
There is also a fascinating story over in Daniel 10 in which Daniel has been praying and fasting for three weeks or so.
In this chapter we find angels battling through with the answer to a man`s prayer. In the New Testament a passage which gives us great insight into the spiritual realm is found in
10 Finally, my brethren, be strong in the Lord, and in the power of his might.
11 Put on the whole armour of God, that ye may be able to stand against the wiles of the devil.
12 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.
13 Wherefore take unto you the whole armour of God, that ye may be able to withstand in the evil day, and having done all, to stand.
14 Stand therefore, having your loins girt about with truth, and having on the breastplate of righteousness;
15 And your feet shod with the preparation of the gospel of peace;
16 Above all, taking the shield of faith, wherewith ye shall be able to quench all the fiery darts of the wicked.
17 And take the helmet of salvation, and the sword of the Spirit, which is the word of God:
18 Praying always with all prayer and supplication in the Spirit, and watching thereunto with all perseverance and supplication for all saints;
The bad news is that the heavenlies  are teeming with a huge host of organized malignant spirits who hate God and his people.
The good news is that Jesus Christ has completely defeated them with his victory on the cross, and by his resurrection and ascension.
Verse 15; And having spoiled principalities and powers, he made a show of them openly, triumphing over them in it.
By His victory , Jesus has made it obvious that these evil spirits were powerless to prevent his resurrection, and because of this, this verse shows us that we should not fear death as he is able to resurrect each believer in turn. He has also given us a full suit of amour  to stand against the devil, which in essence is just living a deliberate holy lifestyle.
So, as we are in a battle with these wicked spirits (they are the ones who stir up persecution and write the scripts that set the standard for what goes in society), we must continue to struggle against them and their influence on individuals and groups.
But let us not forget that Jesus disarmed them by taking away their ability to put the fear of death into God`s people and hence we can stand against them and bring in God`s will into any particular situation.
 The church is engaged in a spiritual war, and its enemy is Satan and a host of unseen angelic and celestial enemies whose power vastly exceeds our own. With a few exceptions, our enemies remain invisible to our eyes, but they nevertheless are real, and so is their opposition. These celestial enemies come in various forms, as is suggested by the variety of terms used by Paul to identify them: “rulers ” these are the 5 star generals, “powers,” “world forces of this darkness,” “spiritual forces of wickedness in the heavenly places”. In this war Satan employs a variety of strategies to oppose and to defeat the Christian. Paul does not speak of one single “scheme”, but of his many “schemes” (plural), likewise, there are different parts of God’s armour that we must put on to counteract each of them. Satan’s opposition against the church is not a frontal attack, but a subversive attack through intrigue, deception, and trickery, so we must remain prayerful and alert (Eph 6:18, 1 Peter 5:8).
 Victory with the devil under our feet Psalm 110:1The Lord says to my lord: “Sit at my right hand until I make your enemies a footstool for your feet.” Victory over demons Colossians 1:15 The Son is the image of the invisible God, the firstborn over all creation. 16 For in him all things were created: things in heaven and on earth, visible and invisible, whether thrones or powers or rulers or authorities; all things have been created through him and for him. Victory over sin and the ability to pull down strongholds 2 Corinthians 10:4 For the weapons of our warfare are not carnal, but mighty through God to the pulling down of strongholds. 5 We demolish arguments and every pretension that sets itself up against the knowledge of God, and we take captive every thought to make it obedient to Christ.  When we put on the armour, we are putting on Christ. Of course, the whole armour of God is describing a day-to-day lifestyle lived in the knowledge of all that God has provided to protect us. Please note we should always be praying. Sometimes we can extend the shield of our faith over others, what do you think? It is important to remember that when we put on the “full armour of God” we are putting on Christ (Rom. 13:14) Rather, clothe yourselves with the Lord Jesus Christ, and do not think about how to gratify the desires of the sinful nature. (Eph 4:23) to be made new in the attitude of your minds; and to put on the new self, created to be like God in true righteousness and holiness. Our protection against Satan’s attacks is assured only when we take up the full armour of God. Satan’s schemes are many, and he attacks us at any point where we are weak. Our armour must be complete. We cannot pick and choose what parts of the armour we prefer, but rather we must put all of it on. We must be completely equipped, or we will be vulnerable to his attacks.