Wisdom of Ben Sira 32:6-8

New Catholic Bible

⁶ Like an emerald in a setting of gold
    are the strains of music with superb wine.
⁷ You who are young, speak only if you are obliged to do so,
    and no more than twice, and then only if asked.
⁸ Be brief, but say much in a few words;
    convey the impression of knowledge but preferring to hold your tongue.