When fighting this present darkness

“For we do not wrestle against flesh and blood, but against the rulers, against the authorities, against the cosmic powers over this present darkness, against the spiritual forces of evil in the heavenly places.” Ephesians 6:12 ESV)

Recognize the enemy at work 

“Be sober-minded; be watchful. Your adversary the devil prowls around like a roaring lion, seeking someone to devour.” (1 Peter 5:8 ESV)

“And no wonder, for even Satan disguises himself as an angel of light.” (2 Cor. 11:14 ESV)

We have been given divine power for spiritual battles 

“For the weapons of our warfare are not of the flesh but have divine power to destroy strongholds.” (2 Cor. 10:4 ESV) 

“And you will know the truth, and the truth will set you free.” (John 11:32 ESV)

“For everyone who has been born of God overcomes the world. And this is the victory that has overcome the world—our faith.” (1 John 5:4 ESV)

Therefore…

“Therefore take up the whole armor of God, that you may be able to withstand in the evil day, and having done all, to stand firm.  Stand therefore, having fastened on the belt of truth, and having put on the breastplate of righteousness, and, as shoes for your feet, having put on the readiness given by the gospel of peace. In all circumstances take up the shield of faith, with which you can extinguish all the flaming darts of the evil one;  and take the helmet of salvation, and the sword of the Spirit, which is the word of God, praying at all times in the Spirit, with all prayer and supplication. To that end, keep alert with all perseverance, making supplication for all the saints…” (Eph 6:13-18 ESV)

“Submit yourselves therefore to God. Resist the devil, and he will flee from you.” (James 4:7 ESV)

Quotes:

"Enemy-occupied territory…… that is what this world is. Christianity is the story of how the rightful king has landed, you might say landed in disguise, and is calling us all to take part in a great campaign in sabotage." C.S. Lewis

“The trumpet still plays the notes of war. You cannot sit down and put the victory wreath on your head. You do not have a crown. You still must wear the helmet and carry the sword. You must watch, pray, and fight. Expect your last battle to be the most difficult, for the enemy’s fiercest charge is reserved for the end of the day.”Charles Spurgeon