Wisdom of Ben Sira 32:8-10

New Catholic Bible

⁸ Be brief, but say much in a few words;
    convey the impression of knowledge but preferring to hold your tongue.
⁹ Among eminent people do not act as if you were their equal,
    and do not continue to babble on when someone else is speaking.
¹⁰ As lightning flashes before thunder strikes,
    so does esteem go ahead of a modest man.