Albert Barnes Commentary Job 30:26

"When I looked for good, then evil came; And when I waited for light, there came darkness." — Job 30:26 (ASV)

When I looked for good - When I supposed that respect would be shown me; or when I looked forward to an honored old age. I expected to be made happy and prosperous through life, as the result of my uprightness and benevolence; but, instead of that, calamity came and swept all my comforts away. He experienced the instability which most people are called to experience, and the divine dealings with him showed that no reliance could be placed on confident plans of happiness in this life.