"People sometimes ask me if it is a sin in the Church of Emacs to use vi. Using a free version of vi is not a sin; it is a penance. So happy hacking"

This quote by Richard Stallman is a funny way of expressing his viewpoint on the use of vi, a text editor. He is recommending that utilizing a totally free variation of vi is not a sin, however rather a penance. This indicates that he believes that using vi is not the best choice, however it is still appropriate. He is also suggesting that the Church of Emacs, which is a reference to the open source software motion, is the preferred choice. He is motivating people to use Emacs, but acknowledges that utilizing vi is still appropriate. He ends the quote with "delighted hacking", which is a way of revealing his assistance for the open source software motion. In general, this quote is a humorous method of expressing Richard Stallman's opinion on using vi and his assistance for the open source software motion.