I was driven by the concept of courage vs fear. We'll never really know the depths of our courage and what we can do if we avoid facing fear or doubt, allowing it to decide for us. And therefore never growing or changing.
L really wanted to express that no matter how much darkness we feel surrounds us or feel that things are trying to keep us down and hold us back, we need to remember that we have what it takes to fight and win, just decide to give it all you've got.