What are the motifs in The Miracle Worker by William Gibson?

Language and meaning are recurring ideas. It is during the climactic scene at the end of Act Three that the second major theme, language and meaning, is resolved. The importance of language is first emphasized in an early scene between Kate and Annie, shortly after Annie's arrival. Kate begins by asking Annie what she plans to teach Helen and Annie answers, "First, last, and in between, language.... Language is to the mind more than light is to the eye." Annie is actually quoting someone else's words at this point, but it is obvious that she realized the significance of it because she was once blind herself and has benefitted from the language that she has learned. The question for Annie is how and whether it is possible to teach Helen language and its meaning.