God‘s love is the big gun in the battle of the ages for men‘s souls. It comes with a 100% guarantee from God.
1 Corinthians 13:8 Love never fails

God‘s love is a shocking force when it is demonstrated through followers of Jesus especially when the recipient knows that it came from strength and not weakness. That is why it is such an effective weapon in the war against the demonic realm. Love is what held Jesus on the cross when He could have wiped out His enemies with a single word. Love is what defeated satan. 

Love is expressed from a position of strength and not from a position of weakness. In other words, God‘s love flowing through us is not based on the weakness of fear because true love actually eliminates fear. God‘s love is based on faith and not fear. 
1 John 4:18 There is no fear in love; but perfect love casts out fear, because fear involves punishment, and the one who fears is not perfected in love. 

When we love instead of take revenge or control, we pull out the big gun in our spiritual battle. The demonic realm has no defense against this nuclear option because God‘s love overcomes evil. Love is not based on emotion, it is actually a battle technique exhibited by choice. It is designed to inspire humans fighting for the demonic kingdom to come over to God‘s kingdom and help defeat their former rulers. 

When we give up our right to revenge, and show love, we intensify the battle for those coming against us. We transfer our case to the supreme court of heaven and God knows how to repay, win the winnable and defeat the demonic realm in the process. 
Romans 12:19 Never take your own revenge, beloved, but leave room for the wrath of God, for it is written, "VENGEANCE IS MINE, I WILL REPAY," says the Lord. 20 "BUT IF YOUR ENEMY IS HUNGRY, FEED HIM, AND IF HE IS THIRSTY, GIVE HIM A DRINK; FOR IN SO DOING YOU WILL HEAP BURNING COALS ON HIS HEAD." 21 Do not be overcome by evil, but overcome evil with good.