What does Psalm 121:8 mean?

"Going out and coming in" translates a Hebrew expression referring to daily work and daily activities. Going out referred to a man's leaving home in the morning to labor and coming in referred to his returning home after work. Throughout all the activities of the day, the believer could be confident of the Lord's presence and protection.

Psalm 104:23 says, "Man goes out to his work and to his labor until the evening." Perhaps, an awareness of the Lord's watchful care throughout each workday would revolutionize the way we perform our duties on the job. In his letter to the Colossians, Paul exhorted servants to work in everything with sincerity of heart, reverencing the Lord. Further, he exhorted them to work heartily, knowing the Lord rewards faithful service (see Colossians 3:22–24). The promise that the Lord watches over His people extends from every day to eternity (Psalm 121:8). The Lord's promise to be with us forever keeps us from covetousness and fear (Hebrews 13:5–6).