Comfort your hearts,.... That is, apply the comfort given, and cause it to be received, which unbelief is apt to refuse; and increase it, by shedding abroad the love of Christ, and of the Father; by the discoveries of pardoning grace; by the application of Gospel promises; by the word and ordinances, which are breasts of consolation; and by indulging with the gracious presence, and comfortable communion of Father, Son, and Spirit.
The Arabic version reads, "comfort your hearts by his grace", joining the last clause of the preceding verse to this. This petition stands opposed to a being troubled and distressed about the sudden coming of Christ, as the following one does to a being shaken in mind on that account, 2Th 2:2.
And stablish you in every good word and work; that is, in every good word of God, or truth of the Gospel, which contains good tidings of good things, so as not to waver about them, or stagger in them, or to depart from them; in practice of every duty, so as to be steadfast, and immoveable, and always abounding therein; good words and good works, principles and practices, should go together, and the saints stand in need of stability in both.
For though, as to their state and condition, they are established in the love of God, in the covenant of grace, in the arms of Christ, and in him the foundation, so as they can never be removed; yet they are often very unstable, not only in their frames, and in the exercise of grace, but in their attachment and adherence to the Gospel and interest of Christ, and in the discharge of duty.