Masons [have been known to] occasionally change certain things to keep known secrets to stay secret: 'letter and begin', for example. Duncans Ceremonies is the

Masons [have been known to] occasionally change certain things to keep known secrets to stay secret: 'letter and begin', for example. Duncans Ceremonies is the most famous revelation of Masonic secrets, but no dues-card and not being 'in the book', ultimately counts for nothing, as you won't even be able to properly converse with a mason, nor enter a lodge, without either.