Matthew Poole and continuators on 2 Thessalonians 3:13

13 But ye, brethren , be not weary in well doing .

The Apostle now directs his speech to those of the Church, that were not guilty of the disorders before mentioned, to whom he speaks in mild and familiar Language, as if the others deserved not to be so called.

And that which he speaks to them is, not to be weary of well-doing. The Greek word is often used about sufferings, as 2 Cor. 4.1. Eph. 3.13. and then usually Translated fainting, and which seems to be its most proper use, to shrink or faint as cowards in War, [non-Latin text not transcribed], Ne segnescite, desmite, desatigamini, it signifies a receding or fainting, or tiring in our duty, because of the evil that attends it, sometimes its used of prayer, Luke 18.1. and sometimes generally of all duties of Religion, which are generally call'd well doing, Gal. 6.9. and signifies either a slothfulness in them, or weariness of them; as those whom the Prophets complain of, Amos 8.5. Mal. 1.13. the Apostle useth the same word in this sence, Gal. 6.9. Be not weary of well-doing; and in the Text, those that did walk orderly, he exhorts them to hold on their course, either more peculiarly to the works of Charity, which are called well-doing, Phil. 4.14. Though those that workt not did not deserve them, or enjoy them, yet this should not discourage them from practising them towards others; or the word may extend more generally to all good works, we should persevere in them without fainting or weariness, notwithstanding the evils that may threaten us therein.

Marginal references: Or, faint not.