WHO said two of the fairest stars in all the heaven?

The phrase "two of the fairest stars in all the heaven" is from William Shakespeare's play "Romeo and Juliet." It is spoken by Romeo in Act 2, Scene 2, during the famous balcony scene, where he compares Juliet's beauty to bright stars. This imagery emphasizes her radiance and importance in his life, highlighting the theme of love and idealization in the play.