Ecclesiastes 10:9-11

English Standard Version

^9 (A)He who quarries stones is hurt by them,
    and he who ^(B)splits logs is endangered by them.
¹⁰ If the iron is blunt, and one does not sharpen the edge,
    he must use more strength,
    but wisdom helps one to succeed.^[a]
11 If the serpent bites before it is ^(C)charmed,
    there is no advantage to the charmer.