To keep our heart singing when the cloudy day comes, it must be made calm and steadfast by faith in something more stable than earthly circumstances. My heart is fixed, O God, my heart is fixed. The trials and sorrows we experience in the night seasons of life make this fixed heart hard to keep. It is hard to keep up our faith when all is dark about us. It is hard to hold on to our confidence when we are shut up in a cave.
Prayer is the secret of keeping a fixed heart and keeping in the heart a song in the night.