'Dark' in the Bible

What I say to you in the dark (privately), tell in the light (publicly); and what you hear whispered in your ear, proclaim from the housetops [to many people].

So if your whole body is illuminated, with no dark part, it will be entirely bright [with light], as when the lamp gives you light with its bright rays.”

and they got into a boat and started to cross the sea to Capernaum. It was already dark, and Jesus had still not come [back] to them.

Once more Jesus addressed the crowd. He said, “I am the Light of the world. He who follows Me will not walk in the darkness, but will have the Light of life.”

So Jesus said to them, “The Light is among you [only] a little while longer. Walk while you have the Light [keep on living by it], so that darkness will not overtake you. He who walks in the darkness does not know where he is going [he is drifting aimlessly].

“I have told you these things in figurative language (veiled language, proverbs); the hour is now coming when I will no longer speak to you in figures of speech, but I will tell you plainly about the Father.

Now on the first day of the week Mary Magdalene came to the tomb early, while it was still dark, and saw the stone [already] removed from the [groove across the entrance of the] tomb.

Among these [unbelievers] we all once lived in the passions of our flesh [our behavior governed by the sinful self], indulging the desires of human nature [without the Holy Spirit] and [the impulses] of the [sinful] mind. We were, by nature, children [under the sentence] of [God’s] wrath, just like the rest [of mankind].

so that you may prove yourselves to be blameless and guileless, innocent and uncontaminated, children of God without blemish in the midst of a [morally] crooked and [spiritually] perverted generation, among whom you are seen as bright lights [beacons shining out clearly] in the world [of darkness],

So we have the prophetic word made more certain. You do well to pay [close] attention to it as to a lamp shining in a dark place, until the day dawns and light breaks through the gloom and the morning star arises in your hearts.

But the one who habitually hates (works against) his brother [in Christ] is in [spiritual] darkness and is walking in the darkness, and does not know where he is going because the darkness has blinded his eyes.