What does the light at the START of the tunnel mean? I know what the light at the end of the tunnel means, that there's always help, but I have no clue what to say for a speech about the light being at the start.

If there's light at the start of the tunnel, then is the rest of the tunnel dark? Can you see the end of the tunnel? Is there a dead-end there? Or maybe a curve so you can't see the end?