en_tn/1ti/01/19.md

a good conscience

"a conscience that chooses right instead wrong." See how you translated this in 1 Timothy 1:5.

some have shipwrecked their faith

Paul speaks of these people's faith as if it were a ship that could be wrecked at sea. He means that they have ruined their faith and no longer believe in Jesus. You should use this or a similar metaphor if it will be understood in the project language. (See: rc://en/ta/man/translate/figs-metaphor)