Ben Sira 5:11

9 Be certain about what you believe and consistent in what you say. Don't try to please everyone or agree with everything people say.

11 Always be ready to listen, but take your time in answering.

12 Answer only if you know what to say, and if you don't know what to say, keep quiet.

13 Speaking can bring you either honor or disgrace; what you say can ruin you.