not slothful in business - The word rendered “business” means “zeal,” “diligence,” “purpose”; denoting the energy of action.
serving the Lord - that is, the Lord Jesus (see Eph 6:5-8). Another reading - “serving the time,” or “the occasion” - which differs in form but very slightly from the received reading, has been adopted by good critics [Luther, Olshausen, Fritzsche, Meyer]. But as manuscript authority is decidedly against it, so is internal evidence; and comparatively few favor it. Nor is the sense which it yields a very Christian one.