Sirach 20:6-8

Revised Standard Version

⁶ There is one who keeps silent because he has no answer,
    while another keeps silent because he knows when to speak.
⁷ A wise man will be silent until the right moment,
    but a braggart and fool goes beyond the right moment.
⁸ Whoever uses too many words will be loathed,
    and whoever usurps the right to speak will be hated.