Author J.K. Rowling on Monday took a wry swipe at Christian fundamentalists who deploy the phrase, “I’m praying for you.”

Speaking at the 2016 PEN America Literary Gala, the “Harry Potter” author drew a parallel between religious fundamentalism and freedom of expression, and spoke about a past encounter with a Christian fundamentalist inside a New York toy store.

“I had no idea the phrase, ‘I’m praying for you,’ could sound so intimidating,” Rowling said.

She continued, “My critics are at liberty to claim that I am trying to convert children to Satanism. And I’m free to explain that I’m exploring human nature and morality — or to say you’re an idiot, depending on which side of the bed I got out of that day.”

PEN America is a 90-year-old organization dedicated to ensuring freedom of expression through literature and information. During the same speech, Rowling also criticized the “safe space” phenomenon, and specifically defended Donald Trump’s right to speak his mind, repugnant though she finds his views.

Rowling’s speech was at the American Museum of Natural History in New York City.