This Halloween quote Instagram post conjures up Halloween without being sinister. Who could be afraid when the moon is smiling? It's difficult to imagine Halloween without black cats, witches, and the moon. This delightful Halloween quote's author is unknown but dates back to at least the nineteenth century when it appeared on vintage postcards. No Halloween quotes would be complete unless these famous witchy words from William Shakespeare's crones circling a cauldron in his play Macbeth was included.