Wisdom of Ben Sira 8:17-19

New Catholic Bible

¹⁷ Never discuss your plans with a fool,
    since he is unable to keep a confidence.
¹⁸ In the presence of a stranger do nothing that should be kept secret,
    for you cannot be certain what use he will make of it.^[a]
19 Do not reveal your thoughts to anyone,
    or he may take away your happiness.