As we had much of Christ in the 53rd chapter, and much of the church of Christ in the 54th chapter, so in this chapter we have much of the covenant of grace made with us in Christ. The "sure mercies of David," which are promised here (Isa 55:3), are applied by the apostle to the benefits which flow to us from the resurrection of Christ (Act 13:34), which may serve as a key to this chapter; not but that it was intended for the comfort of the people of God that lived then, especially of the captives in Babylon, and others of the dispersed of Israel; but unto us was this gospel preached as well as unto them, and much more clearly and fully in the New Testament. Here is, I. A free and gracious invitation to all to come and take the benefit of gospel grace (Isa 55:1). II. Pressing arguments to enforce this invitation (Isa 55:2-4). III. A promise of the success of this invitation among the Gentiles (Isa 55:5). IV. An exhortation to repentance and reformation, with great encouragement given to hope for pardon thereupon (Isa 55:6-9). V. The ratification of all this, with the certain efficacy of the word of God (Isa 55:10, Isa 55:11). And a particular instance of the accomplishment of it in the return of the Jews out of their captivity, which was intended for a sign of the accomplishment of all these other promises.