'Dark' in the Bible

Then I saw that wisdom is better than foolish ways--as the light is better than the dark.

The wise man's eyes are in his head, but the foolish man goes walking in the dark; but still I saw that the same event comes to them all.

All his days are in the dark, and he has much sorrow, pain, disease, and trouble.

In wind it came and to the dark it will go, and with the dark will its name be covered.

But even if a man's life is long and he has joy in all his years, let him keep in mind the dark days, because they will be great in number. Whatever may come is to no purpose.

While the sun, or the light, or the moon, or the stars, are not dark, and the clouds come not back after the rain;