10. not unrighteous--not unfaithful to His own gracious promise. Not that we have any inherent right to claim reward; for (1) a servant has no merit, as he only does that which is his bounden duty; (2) our best performances bear no proportion to what we leave undone; (3) all strength comes from God; but God has promised of His own grace to reward the good works of His people (already accepted through faith in Christ); it is His promise, not our merits, which would make it unrighteous were He not to reward His people's works. God will be no man's debtor.
      your work--your whole Christian life of active obedience.
      labour of love--The oldest manuscripts omit "labor of," which probably crept in from 1Th 1:3. As "love" occurs here, so "hope," Heb 6:11, "faith," Heb 6:12; as in 1Co 13:13: the Pauline triad. By their love he sharpens their hope and faith.
      ye have showed--(Compare Heb 10:32-34).
      toward his name--Your acts of love to the saints were done for His name's sake. The distressed condition of the Palestinian Christians appears from the collection for them. Though receiving bounty from other churches, and therefore not able to minister much by pecuniary help, yet those somewhat better off could minister to the greatest sufferers in their Church in various other ways (compare 2Ti 1:18). Paul, as elsewhere, gives them the utmost credit for their graces, while delicately hinting the need of perseverance, a lack of which had probably somewhat begun to show itself.

JFB.