# I wrote as I did
"I wrote as I did in my previous letter". Some scholars believe this refers to the letter known as First Corinthians. Other scholars believe this refers to a letter Paul wrote after the letter known as First Corinthians and before this letter.
# I might not be hurt by those who should have made me rejoice
"those who should have made me rejoice might not hurt me"
# my joy is the same joy you all have
"what gives me joy is what gives you joy, too"