"a philter to cure love; you would not cease to love your Bertha--beware to drink!"..."
See in text (The Mortal Immortal)
The noun “philter” refers to a potion, drug, or drink that supposedly creates love for a specific person. Agrippa’s description of the potion is deliberately vague and contradictory. Typically, a philter would incite love, not cure it. It is also unusual that a drink designed to “cure” love would not remove Winzy’s feelings toward Bertha. Of course, Agrippa’s warnings make the drink all the more tempting to the distraught Winzy.