Andrea Bocelli sings this one like he is trying to keep someone from leaving the room. It opens with a plea, "Quédate aquí cerca" (stay here close by), and then a promise: "Verás, verás, verás lo que eres para mí" (you'll see, you'll see, you'll see what you are to me). The repeated verás is a handy one to learn, it's the future of ver (to see), and he leans on it three times in a row.
The rest of the song is pure devotion built from simple pictures. She is "mi tesoro" (my treasure), she is "como el alba que yo espero" (like the dawn I wait for), and while she stays close, "la noche se despide ya" (the night is already saying goodbye). Then he gets a bit dramatic in the best way: if she is dancing up in the sky, "al cielo me escaparé" (I'll escape to the sky) to join her. By the end she is the one who moves everything, "Tú mueves el mundo" (you move the world), even the wind and the wheat. It's over the top, and that's exactly the point of a Bocelli love song.