There is a sentence in "The Little Prince" that roughly means: Don't name things casually. Once you give a name, it will be unique. What is the original sentence?

To me, you are just a little boy, like millions of other little boys. I don't need you, and you don't need me either. To you, I am just a fox, like millions of other foxes. However, if you tame me, we will need each other, and you will be the only one in the universe for me, and I will be the only one for you. .