RobH_en_tn/php/01/16.md

The latter

"Those who proclaim Christ out of good will"

I am put here for the defense of the gospel

This can be stated in active form. Possible meanings are 1) "God chose me to defend the gospel" or 2) "I am in prison because I defend the gospel." (See: rc://en/ta/man/translate/figs-activepassive)

for the defense of the gospel

"to teach everyone that the message of Jesus is true"