"Why?" Jakob asked.
"She joined a nunnery!"
"Obviously this was not the result I desired!"
"It's neither obvious nor relevant. Our contract guaranteed efficacy, not results."
"Efficacy! It didn't work!"
"Unlikely. What happened, precisely?"
"When she drained the cup a light filled her eyes. Amazingly, she became even more beautiful. Then she said she couldn't believe how vain she'd been, how meaningless her life. She would go serve God and man and make the world better. She even begged me to do likewise."
"It appears, then," Jakob replied, "that the love potion was entirely effective."