All plays contain language (except for mime routines) because that is how the playwright communicates what is going on. Language is of supreme importance in all plays and especially in Shakespeare's. Imagery serves a similar purpose.
Asking this question is like asking "Why were musical notes important in Mozart's early compositions?"
i
The audience
the first folio
in 1623
england.
William Shakespeare
1623
the global theater
For the first thirty-nine years of it.
The Globe
Now is the winter of our discontent.
Venus and Adonis, which was published in 1593.