The Lord is good, a stronghold in the day of trouble; and He knows those who trust in Him. (Nahum 1:7)
Believer, you are known by a God who is good and is a good place of security and safety in times of trouble. God is our stronghold, our refuge. When we fill our minds with who God is, what He has done, what He is doing, what He will do, and what He tells us in His word we can have inner safety, protection, comfort, rest and relief. We make God our stronghold by thinking about Him.