Had a conversation this morning with a family who asked about my moving to Kentucky. I told them I was from Indiana and where I lived it was flat for miles, with little difference from rolling hill to rolling hill. Moving to Kentucky was a great difference for me, for where I live is surrounded by proper hills, covered in trees, that form valleys between them where the city dwells. I feel that the mountains referred to in the Psalm were more akin to the hills where I live than the stately Rockies or even the Appalachian range.
Back in those days, people built their cities on hills, primarily for defense, as you could see an enemy coming for miles if your city was built high enough. You could also defend it well as city walls would create an effective deterrent. Thus if you were in the valley, engaged in some conflict, you could look to the mountains, where the fortified cities were, and call for reinforcements. David takes this analogy into the spiritual realm. Where is safety and protection? In the fortress. God is the refuge, the safety, and the fortification. Where does my help come from but from the Lord. He will provide rescue.
When you are in trouble, there is a Rescuer who stands by, ready to send reinforcements. God bless you in your walk today!