Not all sins are committed under the cover of darkness but many are so as not to be detected. Broad daylight deceptive sin (like political corruption, phony business, pornography, etc.) is often done in the open daytime with deception and incitement used as its darkness.
One darkness example was the denial of knowing Jesus by Peter when Jesus was arrested. “A servant girl saw Peter sitting there in the firelight, and looking closely at him, she said, “This man was also with him.”
But Peter said this was not true; he said, “Woman, I don’t know him.” A short time later, another person saw Peter and said, “You are also one of them.”
But Peter said, “Man, I am not!” About an hour later, another man insisted, “Certainly this man was with him, because he is from Galilee, too.” But Peter said, “Man, I don’t know what you are talking about!”
Like Peter we sometimes think our untruth won’t be noticed in the darkness. And, its true many may never know what we do in the darkness. But the very nature of sin, deception and a polluted heart is to somehow convince ourselves that if others don’t know, neither does the Lord. Pretty goofy… also pretty common.
“At once, while Peter was still speaking, a rooster crowed. Then the Lord turned and looked straight at Peter. And Peter remembered what the Lord had said: “Before the rooster crows this day, you will say three times that you don’t know me.” Then Peter went outside and cried painfully” (Luke 22:54-62; also see Mathew 26:69ff; Mark 14:66ff)
Later this same Peter wrote: “God has brought you out of darkness into his marvelous light. … He brought you out of the darkness of sin into his wonderful light.”
(1 Peter 2:9)
“Before the rooster crows twice, you will say three times that you don’t know me.” Jesus