Charles Ellicott Commentary 2 Thessalonians 3:13

"But ye, brethren, be not weary in well-doing." — 2 Thessalonians 3:13 (ASV)

But you, brethren — The last verse was addressed to all those whose consciences would be pricked upon hearing it read at the Eucharist. Now the writer turns to the orderly brethren as a very distinct class. The rhetorical effect of this quick, direct address would be the same as in the well-known story of Napoleon addressing the rioters and requesting that the gentlemen separate themselves from the canaille. The distinction is so pointed that everyone would hasten to join the ranks of the respectable.

Be not weary in well doing — This is an exhortation to the “patience of Christ,” for which the Apostle had prayed. The phrase takes for granted that they had been engaged in “well doing” until now—that is, in acting honorably, walking honestly toward them that are without (1 Thessalonians 4:12). St. Paul is anxious to preserve them from “fainting” (as the word is translated in Galatians 6:9), and thus slipping into similar idleness and bringing scandal upon the Church.