Sirach 20:5-7

New Revised Standard Version Catholic Edition

⁵ Some people keep silent and are thought to be wise,
    while others are detested for being talkative.
⁶ Some people keep silent because they have nothing to say,
    while others keep silent because they know when to speak.
⁷ The wise remain silent until the right moment,
    but a boasting fool misses the right moment.