"Say unto my soul, I am your salvation." Psalm 35:3

To keep water fresh, it must be perpetually running. And to keep the life of God up in the soul, there must be continual exercises. This is the reason why the Lord's people have so many conflicts, trials, painful exercises, sharp sorrows, and deep temptations--to keep them alive unto God; to bring them out of, and to keep them out of that slothful, sluggish, wretched state of carnal security and dead assurance in which so many seem to have fallen asleep--fallen asleep like the sailor upon the top of the mast, not knowing what a fearful gulf is boiling up below. The Lord, therefore, tries the righteous. He will not allow his people to be at ease in Zion; to be settled on their lees, and get into a wretched Moabitish state. He therefore sends afflictions upon them, tribulations, and trials, and allows Satan to tempt and harass them.

And under these feelings the blessed Spirit, from time to time, raises up in them this sigh and cry, Say unto my soul, I am your salvation. None but yourself, Lord, can save me; nothing short of your voice can whisper peace to my conscience; nothing short of your blood can speak away guilt from lying as a heavy burden upon my heart; nothing short of your love shed abroad by the Holy Spirit can make my soul happy in yourself.