Contradiction with Proverbs 15:13
This verse suggests that a merry heart makes a cheerful countenance, whereas 2 Corinthians 2:4 speaks of writing out of much affliction and anguish of heart.
Proverbs 15:13: A merry heart maketh a cheerful countenance: but by sorrow of the heart the spirit is broken.
Contradiction with Philippians 4:4
This verse encourages believers to rejoice always, which contradicts the expression of sorrow and tears found in 2 Corinthians 2:4.
Philippians 4:4: Rejoice in the Lord alway: [and] again I say, Rejoice.
Contradiction with 1 Thessalonians 5:16
Similar to Philippians 4:4, it urges continuous rejoicing, contrary to the feelings of sorrow described in 2 Corinthians 2:4.
1 Thessalonians 5:16: Rejoice evermore.
Contradiction with James 1:2
Advises counting trials as joy, which contrasts with the distress and anguish mentioned in 2 Corinthians 2:4.
James 1:2: My brethren, count it all joy when ye fall into divers temptations; [temptations: or, trials]