Colossians 2:2

Translate, "That their hearts may be comforted." The "their," compared with "you" (Col 2:4), proves that in Col 2:1 the words, "have not seen my face in the flesh," is a general designation of those for whom Paul declares he has "conflict," including the particular species, "you (Colossians) and them at Laodicea." For it is plain, the prayer "that their hearts may be comforted," must include in it the Colossians for whom he expressly says, "I have conflict." Thus it is an abbreviated mode of expression for, "That your and their hearts may be comforted." ALFORD translates, "confirmed," or allows "comforted" in its original radical sense strengthened. But the Greek supports English Version: the sense, too, is clear: comforted with the consolation of those whom Paul had not seen, and for whom, in consequence, he strove in prayerful conflict the more fervently; inasmuch as we are more anxious in behalf of absent, than present, friends [DAVENANT]. Their hearts would be comforted by "knowing what conflict he had for" them, and how much he is interested for their welfare; and also by being released from doubts on learning from the apostle, that the doctrine which they had heard from Epaphras was true and certain. In writing to churches which he had instructed face to face, he enters into particular details concerning them, as a father directing his children. But to those among whom he had not been in person, he treats of the more general truths of salvation.

— Jamieson-Fausset-Brown Commentary (public domain)