Psalm 42

The psalmist points out that exile is a place of sorrows and heart breaks. But God's omnipresence means that it doesn't have to be a lonely place. God will always be with his people regardless of where they dwell. If we are in the center of his will then God is nearby. If we rebel against his commands it does not mean that God is far away. Since God is always at work in our lives we must vigilently watch for the fruit of his labor. From that harvest we can sing songs of joy as we lay down to rest.
Stuart