NET

15 For all these things are for your sake, so that the grace that is including more and more people may cause thanksgiving to increase to the glory of God.

Darby

15 For all things [are] for your sakes, that the grace abounding through the many^D8416 may cause thanksgiving to abound to the glory of God.

Darby Bible Notes

many - 'Grace abounding through the many.' The grace of God, perfect in itself, multiplies itself in its objects, so that thanksgiving abounds. Paul was delivered, but everything was for the assembly. It was not therefore merely a benefit to him, but still more to all, so that the grace or benefit was multiplied, and caused thanksgiving to abound to God's glory. The form of thought is peculiar, but the sense plain and striking.

KJV

15 For all things [are] for your sakes, that the abundant grace might through the thanksgiving of many redound to the glory of God.

Strong's

15 For ^G1063 all things^G3956 are for^G1223 your^G5209 sakes^G1223, that^G2443 the abundant^G4121 grace^G5485 might^G4052 through^G1223 the thanksgiving^G2169 of many^G4119 redound^G4052 to^G1519 the glory^G1391 of God^G2316.