Be a rock of refuge for me,
a strong fortress to save me!
Our reliance on God in adversity is a principle method of glorifying Him. Active service is good, but the passive confidence of faith is not one jot less esteemed in God’s sight.
The words appear to embrace and fasten on the LORD with a confident grip of faith that is not to be relaxed. The personal pronouns lay hold on the LORD’s faithfulness. We need grace to have our hearts fixed in a firm belief in God! The figure of a rock and a fortress may be illustrated by the fortress of Gibraltar, often besieged by enemies but never wrested from its defenders. Ancient strongholds, though far from impregnable by modern warfare, were important in those remote ages. Fleeing to the mountains, feeble bands felt secure. Note the singular fact that David asked the LORD to be his rock, because He was his rock. Let us learn from it that we may pray to enjoy in experience what we grasp by faith. Faith is the foundation of prayer.
Charles H. Spurgeon, from The Treasury of David, Psalm 31:2.