2 Corinthians 3:14; 2 Corinthians 8:10; 2 Corinthians 9:11

14 But their minds were blinded : for until this day remaineth the same vail untaken away in the reading of the old testament; which vail is done away in Christ.
10 And herein I give my advice: for this is expedient for you, who have begun before , not only to do , but also to be forward a year ago.
11 Being enriched in every thing to all bountifulness, which causeth through us thanksgiving to God.