Sirach 37:19-21

Revised Standard Version Catholic Edition

¹⁹ A man may be shrewd and the teacher of many,
    and yet be unprofitable to himself.
²⁰ A man skilled in words may be hated;
    he will be destitute of all food,
²¹ for grace was not given him by the Lord,
    since he is lacking in all wisdom.