Looking for a source

Beatitudes for Special People are all over the web, but there are at least three different authors attributed: Marjorie Chappell, Lionel Blue, and Robert Perske. Anyone have a definitive source? It starts out like this:

"Blessed are you who take time to listen to defective [or difficult] speech, for you help us to know that if we persevere, we can be understood."

Please post a comment if you know anything or have a lead. Thanks!