Wisdom of Ben Sira 32:9-11

New Catholic Bible

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.
¹¹ Leave at an appropriate time, and do not be the last to depart;
    go home quickly, without lingering.