"Take care that you remain tranquil and do not fear." Isaiah 7:4
Almost everyone fears something. Take the most powerful person in the world, the richest, the most beautiful, the most intelligent, and there's one or more fears lurking around them somewhere. There's the fear of being wrong, of death, of rejection, of failure, of being laughed at, of abandonment, of lack, etc etc. The trouble with fear is it keeps us from God's best.
Here in this passage, God tells King Ahaz through Isaiah that he should not fear the two neighboring kingdoms threatening to invade his country, but Ahaz trembles. Many kingdoms try to invade our peace. Just yesterday, my son left for Turkey with a friend. They are going to attend World Youth Day in Poland, but before that, they will go see some of Czechoslovakia, Hungary and Germany. If I allow thoughts of what CAN happen while they are away to enter my head like a runaway crazy dog, I will never be able to let my son go and grow up and experience what God has in store for him. We have to CHOOSE to trust God. We have to choose to trust God through cancer, through Isis threats, through losing a job, through any "kingdom" that wants to invade our home, our family, our neighborhood, or country. God is enough if we keep our eyes on Him. If we are able to keep our eyes on God through anything, we can be more than conquerors!