Worship is the glorifying of God, the making much of him, the magnifying of him so that he increases in coordination with our decrease.
Jesus tells his disciples that their good works should be lights shined on God (Matt. 5:16), meant to illuminate him for the benefit of those in the darkness, showing them the way out. The only way our good works will work this way – to repeat, the only way – is if our good works are acts of worship. This means our good works must be our response to the finished good work of Christ. If our good works are viewed as currency to exchange for the good work of Christ, they will be seen by the lost not as illuminating God’s goodness but illuminating ours.
Good works as worship are acts of thankfulness and joy. Good works as merit are acts of leverage and bribery. They do not magnify the God of free grace but make him appear like a loan officer. And God is not accepting applications for service; he is redeeming captives who then gratefully serve him of their own free(d) will. We invite the Spirit’s filling with our good works as we “sow to the Spirit” (Gal. 6:8), but we do not earn him with them. (Jared Wilson in Gospel Wakefulness)