A person that moves large stones might be hurt by them. And a person that cuts trees is in danger—\{the trees might fall on him\}.
But wisdom will make any job easier. It is very hard to cut with a dull knife. But if a person sharpens the knife, then the job is easier. \{Wisdom is like that.\}
A person that digs a hole might fall into it. A person that knocks down a wall might be bitten by a snake.