Jamieson, Fausset & Brown

comfort yourselves--Greek, "one another." Here he reverts to the same consolatory strain as in Th1 4:18. edify one another--rather as Greek, "edify (ye) the one the other"; "edify," literally, "build up," namely, in faith, hope, and love, by discoursing together on such edifying topics as the Lord's coming, and the glory of the saints (Mal 3:16).