Commentaries:
Robertson's Word Pictures (NT)
But ye, brethren, be not weary in well-doing (umeiv de, adelfoi, mh enkakhshte kalopoiountev). Emphatic position of umeiv in contrast to these piddlers. Mh and the aorist subjunctive is a prohibition against beginning an act (Robertson, Grammar, pp. 851-4). It is a late verb and means to behave badly in, to be cowardly, to lose courage, to flag, to faint, (en, kakov) and outside of Luke 18:1 in the N.T. is only in Paul's Epistles (II Thessalonians 3:13; II Corinthians 4:1, II Corinthians 4:16; Galatians 6:9; Ephesians 3:13). It occurs in Polybius. The late verb kalopoiew, to do the fair (kalov) or honourable thing occurs nowhere else in the N.T., but is in the LXX and a late papyrus. Paul uses to kalon poiein in II Corinthians 13:7; Galatians 6:9; Romans 7:21 with the same idea. He has agaqopoiew, to do good, in I Timothy 6:18.
Other Robertson's Word Pictures (NT) entries containing 2 Thessalonians 3:13:
Galatians 6:9
Ephesians 3:13
2 Thessalonians 3:13
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