The diseases that come along with aging continue to warn our souls of the impending death lurking around the corner. This realization causes spiritual shaking in our souls. Our coming death sums up our weak bottom before God. Thus, we need a genuine source of strength that is not from this world, and that source is Jesus Christ, for He said, “My grace is sufficient for thee.”
But since the birth of Christianity, the true followers of our Lord have experienced this Christian doctrine of Spirit-caused calmness of the soul. They wrote songs and hymns hundreds of years ago with the same lyrical subject of joy in the Lord, and churches have used them in their services until now.