Colossians 1:1

Apostle - Messenger; one who has been sent.

Paul, an apostle - by the will of God - As the word αποστολος, apostle, signifies one sent, an envoy or messenger, any person or persons may be the senders: but the word is particularly restrained to the messengers of the everlasting Gospel, sent immediately from God himself; and this is what St. Paul particularly remarks here when he calls himself an apostle by the will of God; signifying that he had derived his commission from an express volition or purpose of the Almighty.

And Timotheus - Though Timothy is here joined in the salutation, yet he has never been understood as having any part in composing this epistle. He has been considered as the amanuensis or scribe of the apostle.

Paul, an apostle of Jesus Christ - See the notes. at Romans 1:1

By the will of God - Notes, 1 Corinthians 1:1.

And Timotheus our brother - On the question as to why Paul associated others with him in his epistles, see the notes at 1 Corinthians 1:1. There was a particular reason why Timothy should be associated with him in writing this Epistle. He was a native of the region where the church was situated Acts 16:1-3, and had been with Paul when be preached there, and was doubtless well known to the church there; Acts 16:6. It is evident, however, from the manner in which Paul mentions him here, that he did not regard him as "an apostle," and did not wish the church at Colosse to consider him as such. It is not "Paul and Timothy, apostles of Jesus Christ," but "Paul, an apostle of Jesus Christ, and Timothy our brother." Paul is careful never to apply the term "apostle" to Timothy; Philippians 1:1. "Paul and Timotheus, the servants of Jesus Christ;" compare 1 Thessalonians 1:1; 2 Thessalonians 1:1. If he had regarded Timothy as an apostle, or as having apostolic authority, it is not easy to conceive why he should not have referred to him as such in these letters to the churches. Could he have failed to see that the manner in which he referred to him was adapted to produce a very important difference in file estimate in which he and Timothy would be held by the Colossians?