Interpreters are not agreed what the apostle here meaneth by God's unspeakable gift. Some by it understand Christ, who is the gift of God, and the Fountain of all grace; and to this the epithet unspeakable doth best agree. Others understand the gospel, by which the hearts of men are subdued, effectually disposed, and inclined to obey the will of God. Others think it is to be understood of thai habit of brotherly love, which from the Spirit of Christ, by the gospel, was wrought in the hearts of these Corinthians. If the last be meant, (to which the most incline), the apostle declareth his firm persuasion of them, that they would obey him in this thing, and giveth God thanks for giving them such a heart. Seeing the contribution was not yet made, though a year before they had declared their readiness to it, I should rather incline to interpret it concerning Christ; and that the apostle concludeth this whole discourse about contributing to the relief of these poor members of Christ, with a general doxology, or blessing of God for Jesus Christ, who is the Author and Finisher of all grace, without such a particular reference to the preceding discourse; yet hereby hinting to them, that without the influence of his grace they would, they could do nothing.
Related Commentaries of 2 Corinthians 9:15
2 Corinthians 9:15
15 Thanks be unto God for his unspeakable gift.