Albert Barnes Commentary 2 Corinthians 4:15

"For all things [are] for your sakes, that the grace, being multiplied through the many, may cause the thanksgiving to abound unto the glory of God." — 2 Corinthians 4:15 (ASV)

For all things are for your sakes. All these things: these glorious hopes, and truths, and prospects; these self-denials of the apostles, and these provisions of the plan of mercy.

For your sakes. On your account. They are designed to promote your salvation. They are not primarily for the welfare of those who engage in these toils and self-denials; but the whole arrangement and execution of the plan of salvation, and all the self-denial demonstrated by those who are engaged in making that plan known, are for your benefit. One object of Paul in this statement, doubtless, is to win their favor and remove the objections that had been made against him by a faction in the church at Corinth.

That the abundant grace. Grace abounding, or overflowing. The rich mercy of God that should be revealed by these means. It is implied here that grace would abound by means of these labors and self-denials of the apostles. The grace referred to here is that which would be bestowed on them as a result of these labors.

Through the thanksgiving of many. That many may have reason for gratitude to God; that by these labors more people may be led to praise him. It was Paul’s aim to labor in such a way that as many as possible might be led to praise God and have reason to thank him to all eternity.

Redound to the glory of God. This means that God may receive increased praise and that his glory in the salvation of humanity may abound. The meaning of the passage is that it would be for God’s glory for as many people as possible to be brought to live praise and thanksgivings to him, and therefore Paul endeavored to make as many converts as possible.

He denied himself; he welcomed toil; he encountered enemies; he subjected himself to dangers; and he sought by all possible means to bring as many as could be brought to praise God. The word "redound" (perisseush) here means to abound or be abundant, and the sense is, that the overflowing grace thus demonstrated in the salvation of many would so abound as to promote the glory of God.