# you have been a place of safety ... a shelter ... a shelter from the storm ... a shade from the heat

Yahweh protecting his people is spoken of as if he were a place that the people could go to be safe and comforted. 

# When the breath of the ruthless was like a storm against a wall

Ruthless people oppressing the people of God is spoken of as if they were a storm beating against a wall. 

# the ruthless

"ruthless people" or "those who are ruthless"