This refers to another letter that Paul had written to the Corinthian Christians that no longer exists. AT: "I wrote as I did in my previous letter" (See: [[rc://en/ta/man/translate/figs-explicit]])
Paul is speaking about the behavior of certain Corinthian believers who caused him emotional pain. This can be stated in active form. AT: "those who should have made me rejoice might not hurt me" (See: [[rc://en/ta/man/translate/figs-activepassive]])
# my joy is the same joy you all have
"what gives me joy is what gives you joy, too"
# from great affliction
Here the word "affliction" refers to emotional pain.
# with anguish of heart
Here the word "heart" refers to the location of the emotions. AT: "with extreme sorrow" (See: [[rc://en/ta/man/translate/figs-metonymy]])