http://biblia.com/books/esv/Ps11
David’s friends saw the power of the enemy and out of love of David suggested that he flee from them. He should hide in the mountains. Justice is nowhere to be seen according to them.
David saw the power of God and puts his trust in him. God is a stronger protector than the hiding places of the mountains.
(Mountains just Southeast of Jerusalem)
We’re often tempted to run away from the things we fear.
Fear is forgetting that God still rules and that his justice will be the final word on all things.
Romans 8:31 (NIV84)
31 What, then, shall we say in response to this? If God is for us, who can be against us?