Commentaries:
Robertson's Word Pictures (NT)
For the elect's sake (dia touv eklektouv). "Because of the elect." God's elect (Romans 8:33; Colossians 3:12; Titus 1:1) for whom Paul suffered so much (II Corinthians 1:6; II Corinthians 12:15; Philippians 2:17; Ephesians 3:1, Ephesians 3:13).
That they also may obtain (ina kai autoi tuxwsin). Purpose clause with second aorist (effective) active subjunctive of tugxanw with genitive. "They as well as I," Paul means.
The salvation (thv swthriav). The final salvation "with eternal glory" (meta dochv aiwniou). This phrase only here and I Peter 5:10, but in II Corinthians 4:17 we have "eternal weight of glory."
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