John 8:12
Again, Jesus spoke to them, saying, “I am the light of the world. Whoever follows me will not walk in darkness but will have the light of life.
You can’t see things in the dark, and so the probability of doing negative things is much higher than when in the light. For instance, there’s a greater chance of bumping your head, running into walls, falling into holes, the list goes on and on.
But negative things aren’t all about physical accidents, but also means simply mistakes, mistakes that would be known as sin. For example, if someone is walking in the light, would they choose less sin than someone not walking in the light? And also note that some who are not Christians, might be somewhat walking in the light unknowingly, simply when they are obeying the ten commandments and other moral laws, maybe unknowingly.