In my opinion, the light symbolizes our goal. And darkness, everything that can be prevented or somehow slows down the achievement of this very goal.
That's right, our goal at this point in time should mean a lot to us. We must strive to achieve it, not to be distracted by the little things of life, they will always be. Never give up if you fall, find the strength to raise and continue this hard way to achieve the allotted goal.
Look at the light - aim for the light.