A beautifully lit tunnel is more dangerous than a pitch-black tunnel because you may not want to get out! If you dress the evil in a beautiful dress, the evil will be invisible!

If you entered a tunnel, you can be sure that the tunnel has at least one exit!

If you're trapped in a tunnel with many open exits, the tunnel can't help you! The exit is in your mind!

In a dark tunnel all we need is to move because no exit shall ever appear before us by itself! Move is the very exit itself where there seems to be no exit!