Respuesta :
I would say that the line which implies the author thinks Helen's behavior is going to hurt Helen herself is Don't cut your fingers with the edge / Of your keen wit.
Because her mind and behavior are going to hurt her, or rather make her hurt herself.
Because her mind and behavior are going to hurt her, or rather make her hurt herself.
The line from Helen Grey, which implies that the author thinks Helen's behavior is going to hurt herself is this: DON'T CUT YOUR FINGER WITH THE EDGE OF YOUR KEEN WIT.
Cutting one's finger implies hurting oneself or doing harm to oneself. When a man is said to have a keen wit, that means that, that man has a very sharp intelligence. So in the line given above, what the line is saying essentially is that 'Helen should not hurt herself with her sharp intelligence'.