Which literary character did Robert F. Kennedy quote in his speech at the 1964 Democratic Convention?

At the 1964 national convention, Robert F. Kennedy addressed the convention with what became famous as his "Stars" speech. He quoted Shakespeare when speaking of his brother, the late President John F. Kennedy. "When he shall die, cut him into little stars, and he shall make the face of heaven so fond, that all the world will fall in love with night and pay no worship to the garish sun."

This quotation comes from Romeo and Juliet - Juliet is speaking about Romeo.
https://books.google.com/books?id=3TEJAAAAQAAJ&pg=PA214#v=onepage&q&f=false

You can see footage of the Kennedy speech at this site.

https://www.c-span.org/video/?3418-2/robert-kennedy-1964-convention-speech