Ecclesiastes 10:10-12

New Catholic Bible

¹⁰ If an ax becomes dull from lack of sharpening,
    then one must exert greater strength,
    but skill helps one to succeed.
¹¹ If a snake bites because it has not been charmed,
    there is no profit for the charmer.
¹² The words of a wise man win favor,
    but a fool’s tongue is his undoing.