Sirach 37:19-21

New Revised Standard Version, Anglicised

¹⁹ Some people may be clever enough to teach many,
    and yet be useless to themselves.
²⁰ A skilful speaker may be hated;
    he will be destitute of all food,
²¹ for the Lord has withheld the gift of charm,
    since he is lacking in all wisdom.