Sirach 32:8-10

Common English Bible

⁸ Sum up what you have to say;
much can be said in few words.
Be like one who knows
but who can keep silent.
⁹ When you are among the more influential, don’t presume authority;
    and where elders are present,
    don’t talk idly about many things.
¹⁰ Lightning comes before thunder,
    and good favor walks
    in front of a modest person.