What does this verse teach about our speech? " So make up your minds not to prepare beforehand to defend yourselves; for I will give you [a]utterance and wisdom which none of your opponents will be able to resist or refute. " (Luke 21:14-15)

Do not worry about what to say in testimony. God Himself will give you the words.

Do not speak ill of others.

Let your words be pure, your message be of good report.