1 CORINTHIANS 15:58 So, my dear brothers and sisters, be strong and immovable. Always work enthusiastically for the Lord, for you know that nothing you do for the Lord is ever useless.
BARNES' NOTES Always engaged in doing the will of God; in promoting his glory, and advancing his kingdom. The phrase means not only to be engaged in this, but to be engaged diligently, laboriously; excelling in this. The "work of the Lord" here means that which the Lord requires; all the appropriate duties of Christians. Paul exhorts them to practice every Christian virtue, and to do all that they could do to further the gospel among people.