Darkness always runs away from the light. That’s why our sin can cause us to run away from God. But it doesn’t have to. With sin comes death but with Christ comes the light of life.
In Matthew it says, “The people who sat in darkness have seen a great light, and upon those who sat in the region and shadow of death, Light has dawned” Matthew 4:16 (NKJV).
Death can no longer cast a shadow on those that are in Christ.