Are you saying that 2nd Timothy 2:8 (KJV) is the mystery of Colossians 1:25-26 (KJV)?
Hi and in 2 Tim 2:8 , Paul write it , MY GOSPEL !!
The Greek word MY / EMOU in Greek means it is EMPHATIC , and it DOES not BELONG to any one else and that is why it is Paul's " MY GOSPEL " !!
Yes to what you ASKED it is the MYSTERY !!
dan p