In beginning to expound the Second Epistle to the Thessalonians, it is necessary to say a few words by way of introduction to the book as a whole. Certain questions occur to the mind whenever such a document as this is presented to it; and it will put us in a better position for understanding details if we first answer these. How do we know, for instance, that this Epistle is really the _second_ to the Thessalonians? It has been maintained that it is the earlier of the two. Can we justify its appearance in the place which it usually occupies? I think we can. The tradition of the church itself counts for something. It is quite unmistakable, in other cases in which there are two letters addressed to the same people,--_e.g._, the Epistles to the Corinthians and to Timothy,--that they stand in the canon in the order of time. Presumably the same is the case here. Of course a tradition like this is not infallible, and if it can be proved false must be abandoned; but at the present moment, the tendency in most minds is to under-estimate the historical value of such traditions; and, in the instance before us, tradition is supported by various indications in the Epistle itself. For example, in the other letter, Paul congratulates the Thessalonians on their reception of the gospel, and the characteristic experiences attendant upon it; here it is the wonderful growth of their faith, and the abounding of their love, which calls forth his thanksgiving,--surely a more advanced stage of Christian life being in view. Again, in the other Epistle there are slight hints of moral disorder, due to misapprehension of the Lord's Second Coming; but in this Epistle such disorder is broadly exposed and denounced; the Apostle has heard of unruly busybodies, who do no work at all; he charges them in the name of the Lord Jesus to change their conduct, and bids the brethren avoid them, that they may be put to shame. Plainly the faults as well as the graces of the church are seen here at a higher growth. Once more, in chap. ii. 15 of this letter, there is reference to instruction which the Thessalonians have already received from Paul in a letter; and though he may quite conceivably have written them letters which no longer exist, still the natural reference of these words is to what we call the First Epistle. If anything else were needed to prove that the letter we are about to study stands in its right place, it might be found in the appeal of chap. ii. 1. "Our gathering together unto Him" is the characteristic revelation of the other, and therefore the earlier letter.