Ecc10:10 If the iron has no edge, and he does not make it sharp, then he has to put out more strength; but wisdom makes things go well.
Jer31:29 In those days they will no longer say, The fathers have been tasting bitter grapes and the children's teeth are put on edge.
Jer31:30 But everyone will be put to death for the evil which he himself has done: whoever has taken bitter grapes will himself have his teeth put on edge.
Eze18:2 Why do you make use of this saying about the land of Israel, The fathers have been tasting bitter grapes and the children's teeth are on edge?