(3) Once more, the execution of the plan of salvation in time is of God. To this salvation, says Paul, _He_ called you by our gospel. The apostles and their companions were but messengers: the message they brought was God's. The new truths, the warnings, the summonses, the invitations, all were His. The spiritual constraint which they exercised was His also. In speaking thus, the Apostle magnifies his office, and magnifies at the same time the responsibility of all who heard him preach. It is a light thing to listen to a man speaking his own thoughts, giving his own counsel, inviting assent to his own proposals; it is a solemn thing to listen to a man speaking truly in the name of God. The gospel that we preach is ours, only because we preach it and because we receive it; but the true description of it is, the gospel of God. It is His voice which proclaims the coming judgment; it is His voice which tells of the redemption which is in Christ Jesus, even the forgiveness of our trespasses; it is His voice which invites all who are exposed to wrath, all who are under the curse and power of sin, to come to the Saviour. Paul had thanked God in the First Epistle that the Thessalonians had received his word, not as the word of man, but as what it was in truth, the word of the living God; and here he falls back again on the same thought in a new connection. It is too natural for us to put God as far as we can out of our minds, to keep Him for ever in the background, to have recourse to Him only in the last resort; but that easily becomes an evasion of the seriousness and the responsibilities of our life, a shutting of our eyes to its true significance, for which we may have to pay dear. _God_ has spoken to us all in His word and by His Spirit,--God, and not only some human preacher: see that ye despise not Him that speaketh.