It's easy enough to see that when the people around you are in a bad mood, it brings your own mood down. Or how it's hard to be super happy and silly in a room full of super serious people.

[Which she's all too familiar with both of those, but that's neither here nor there.
Rinoa giggles at Aerith's happiness, buoyed by the fact that someone doesn't actually think she's silly for the things she says sometimes.]

In that case, let's make this the best flower bed we can! For us, for them, and everyone!