The request of Psalm 67:1 is a familiar one—“God be merciful to us and bless us and cause His face to shine upon us.”
The stated rationale for this request is worthy of closer consideration. Instead of seeking God’s mercy, grace, and salvation simply for personal reasons, the composer sought these wonderful blessings so “that Your way may be known on earth, Your salvation among all nations. Let the peoples praise You, O God; let all the peoples praise You. Oh, let the nations be glad and sing for joy! For You shall judge the people righteously and govern the nations on earth” (vv. 2-4).
God’s goodness needs to be known around the globe, so that He receives the proper praise, adoration, and reverence He so deserves. “Let the peoples praise You, O God; let all the peoples praise You. Then the earth shall yield her increase; God, our own God, shall bless us. God shall bless us, and all the ends of the earth shall fear Him” (vv. 5-7).
Seeking God’s grace and favor for the rich personal benefits you receive is not sinful. Failing to be profuse in your praise and thanksgiving for them (so that others know of them) is.