Well, I’d like to start with the fact that calligraphy has its root in handwriting and writing in general.
Writing in general, we must keep in mind, is sound symbols.
So handwriting is a personal voice. It is a deeply intimate thing. When you write a note to someone you are giving them a semi-permanent representation of your voice. Sometimes this is a much more vivid reminder than the recording of our minds.
Calligraphy, then, is singing.
Calligraphy is a kind of voice that has many rules, like singing. Calligraphy has many broken rules, like singing.
Calligraphy puts something unexplainable into words, like singing.