Republican presidential candidate and retired neurosurgeon Ben Carson said in a 2011 speech speech that he thought scientist Charles Darwin was “encouraged by the adversary,” using another word for Satan, when he came up with the theory of evolution.

Carson spoke on “creation vs. evolution” and the “flaws in the evolutionary theory,” according to the description on the YouTube video uploaded by user Three Angels Messages, which has uploaded a variety of news and political videos. The video was flagged on Tuesday by the website BuzzFeed News.

“According to the creation model, in which we have an adversary, it’s very easy to explain why people act that way. It’s because they have choice and because there is an adversary out there,” Carson told the crowd.

Carson discussed Darwin’s theory of evolution and its intersection with religion.

“I personally believe that this theory that Darwin came up with was something that was encouraged by the adversary and it has become what is scientifically politically correct,” he said.

Watch Carson’s comments, which happen around 45:07:

h/t: BuzzFeed News

This post has been updated.