Ephesians 3:16

The He would grant you, according to the riches of His glory, to be strengthened with might through His spirit in the inner man. 

Our strength comes from the Lord, and He is with us at all times. We need to build ourselves up with His strength to conquer any conflict or fear that may come into our lives. Our strength comes when we realize that we must depend on God and remove all our ego. When we get out of the way of God, He can work miracles.