Louis stabbed and wept until he was exhausted. When he laid the tool down and picked up the piece of leather on which he had been taking out his anger, he discovered that there was a piece of paper under it. He ran his fingers over the piece of paper and found that there were bumps on the paper where he had stabbed, and a light came on behind the blind eyes of Louis Braille. Out of the darkness something dawned on Louis Braille that has benefited every blind person since then. Life is difficult for us all.
Darkness is a standard part of normal life.
Pain is a normal part of life. You will never see some things clearly until you see them in the dark. The most enlightening experience in all human history came out of the darkest event of all time. This was the darkest deed ever perpetrated by humankind. Even dumb nature closed its eyes.