Sirach 37:17-19

New Revised Standard Version Catholic Edition

¹⁷ The mind is the root of all conduct;
¹⁸     it sprouts four branches,^[a]
good and evil, life and death;
    and it is the tongue that continually rules them.
¹⁹ Some people may be clever enough to teach many,
    and yet be useless to themselves.