This line is one of the reasons I prefer the game over the anime.
In the anime, Celes says “I can even lie to my own heart” (or something along those lines) which gives the impression that she’s emotionless. But in the game, Aoi asks her if she’s scared, and she says she’s not, but then she laughs. And that laugh sounds forced. And then you know she’s scared. You know she’s not only in it for the money. And you know she has a heart. And then you love her character even more.