en_tn/2ti/01/12.md

For this cause

"Because I am an apostle"

I suffer ... these things

"I am a prisoner"

I am persuaded

"I am convinced"

that day

Possible meanings are 1) the day when the Lord comes again or 2) the day when God judges people.

Keep to the pattern of healthy words which you heard from me

"Keep teaching the correct ideas I have taught you" or "Use my words and my teaching methods as a pattern for what and how you should teach"

healthy words

"correct ideas" or "true words"

That good thing

This refers to the work of proclaiming the gospel correctly.

guard it

Timothy needs to be alert because people will oppose his work, try to make him stop, and distort what he says.

through the Holy Spirit

"do all and only what the Holy Spirit tells you to do"