Light — The light of life. Bitter — Unto those to whom life itself is bitter and burdensome. Life is called light, because it is pleasant and serviceable for walking and working; and this light is said to be given us, because it would be lost, if it were not daily renewed to us by a fresh gift.
Related Commentaries of Job 3:20
Job 3:20
20 Wherefore is light given to him that is in misery, and life unto the bitter in soul;