The little girl wrote: "My name is Ana Luz. I saw all of the Brazil games in the World Cup and I liked it a lot watching you play.
"I think that you don't need to be sad because you played well and did the best you could. You were a great captain.
"Life is like this, sometimes people lose and sometimes people win but people only need to be happy.
“David Luiz, you are my champion.”
Who knew a nine-year-old could be so wise? We're sure this brightened up Luiz's day.