The Apostle warned against false teachers and urged them not to listen to them. “That he may know” points to the Apostle’s concern over whether those false teachers had managed to sow tares.
It also concerns whether the Colossians will listen to his exhortations, and to what extent. For the Apostle, outward life is not the chief matter, but how the work of salvation is proceeding.
He wished to stir up their attention and zeal precisely toward this matter, so that they would examine carefully whether everything was in order and correct what needed correction.
In every way, this should have been the fruit of the Epistle.
Ambrosiaster writes, “Although above he said that he is present with them in spirit, nevertheless there is need also for intermediaries and messengers who are not spiritual.
“Everyone becomes more careful about himself when he sees that someone has come to him precisely to observe how he conducts himself.
“Conscious that there is an eye watching his deeds, he becomes more cautious. God sees everything, and we know that all our affairs are known to Him.
“But because we do not see that He sees us, we do what is contrary to Him.”
“And he will comfort your hearts.” In the Epistle it is not evident that the Colossians were suffering anything unpleasant. Therefore the consolation Tychicus was to bring them should be understood as coming from faithful news about St. Paul and Epaphras.
St. Paul was not a stranger to them. It could not fail to grieve them that he, their true Apostle, was burdened with bonds.
It was still more grievous that he had been sent in bonds so far away, and that nothing was known about him. They sent to him their own closest enlightener, Epaphras, to be with him and serve him, as blessed Theodoret says.
Yet nothing was known about Epaphras either. With what joy they must have received a faithful messenger about them, who had not only seen them but had shared their lot with them.
In his person they received their own dear fathers, and they could not but be filled with great consolation. This was all the more so because the news brought contained nothing extremely grievous.
The bonds, terrifying in themselves, had been lightened for the Apostle by certain concessions, by which he could receive whom he wished and write to whom he wished.
Perhaps, however, as Epaphras could have reported, there were also some troubles at home among the Colossians that required consolation. Yet they were not so great that they needed to be mentioned separately in the Epistle.
It was enough to give Tychicus instructions about them. Our commentators suppose that the Colossians were under temptation and had need of consolation.