Whoever removes [landmark] stones or hews out [new ones with similar intent] will be hurt with them, and he who fells trees will be endangered by them. [Prov. 26:27.]
If the ax is dull and the man does not whet the edge, he must put forth more strength; but wisdom helps him to succeed.
He who digs a pit [for others] will fall into it, and whoever breaks through a fence or a [stone] wall, a serpent will bite him. [Ps. 57:6.]