'Light' in the Bible

Then I saw that [even secular] wisdom [that brings sorrow] is better than [the pleasures of] folly and self-indulgence as light excels darkness.

All of his life he also eats in darkness [cheerlessly, without sweetness and light], with great frustration, sickness, and anger.

The light is sweet and pleasant, and it is good for the eyes to see the sun.

before the sun and the light, and the moon and the stars are darkened [by impaired vision], and the clouds [of depression] return after the rain [of tears];