Sirach 27:5-7

New Revised Standard Version, Anglicised

⁵ The kiln tests the potter’s vessels;
    so the test of a person is in his conversation.
⁶ Its fruit discloses the cultivation of a tree;
    so a person’s speech discloses the cultivation of his mind.
⁷ Do not praise anyone before he speaks,
    for this is the way people are tested.