Note to Romeo and Juliet, 3.3.120-121: "birth, and heaven, and earth, all three do meet / In thee at once"

birth, and heaven, and earth, all three do meet / In thee at once: [your] birth, and heaven, and earth—all three—have combined to give you existence. Here "heaven" and "earth" are also metaphors for soul and body. The Friar's point is that it is senseless for Romeo to complain as he has been doing, because if he hadn't been born, if he didn't have a body or a soul, he would be nothing, and couldn't complain about anything.