It is my duty to prevent you.

I must insist upon your giving me back the phial, unless you will consent to obey my orders." "But I tell you, man, I will have a hundred drops of the cordial," she cried pertinaciously.
"And I say you shall not, my lady," he rejoined, unable in his anger to maintain the semblance of respect he had hitherto preserved, and endeavouring to obtain forcible possession of the phial.
But she was too quick for him.

And as he stretched out his hand for the purpose, the dagger gleamed before his eyes.
"Back, miscreant!" she cried; "your over-eagerness has betrayed you.

I now fully believe what I have hitherto doubted, that this is a counter-poison, and that I may safely use it.

It is time to unmask you, and to let you know that your villanies are discovered.