In the Treasury of David, Spurgeon encourages us from Psalm 30 to keep praying, to keep crying out to the Lord:
Prayer is the unfailing resource of God’s people. If they are driven to their wit’s end, they may still go to the mercyseat. When an earthquake makes our mountain tremble, the throne of grace still stands firm, and we may come to it. Let us never forget to pray, and let us never doubt the success of prayer.