Levi who is called Biff

[Biff settles down in front of the camera. He seems to be lightly grasping something in his hand, but it's small enough that it isn't immediately visible to his viewing audience. He grins.]

I have never been to a place like that port before. I have been to the sea, but this was a different sort of beach. This beach was for holidays and sunbathing and those little drinks with the umbrella in them.

Many people worried, when we went to port, about things like food and what we would drink. [He shakes his head, still smiling, and lowers his voice.] I did not worry.

[He holds up the thing in his hand so everyone can have a look. It's...a shell. Just your average seashell, this one looking a little worse for the wear, with a chipped edge and a small hole through it. It's a very unimpressive specimen, actually.]

This is beautiful.

[He laughs, looking a little abashed for a moment.]

Obviously, I have seen seashells before. Who hasn't seen them? They're everywhere, like rocks. But there are ways in which this specific seashell is beautiful. It is not like other seashells. Okay, it is a little damaged and there is a weird stain on the inside, right there.

[Biff points out the weird stain in question.]

But you can find beauty in things that are damaged, too. They are just beautiful in other ways. I can't fix the hole in the seashell, but if I work hard enough to wash it, maybe the stain will come out.

Even if the stain never comes out, the seashell is still very beautiful.

[He pauses, contemplating where he's going with this analogy.]

Persephone, you are amazing. You are able to make plants grow where there is nothing, and you love this gift. That love is what makes you beautiful.

I must teach you to love people in the way you love plants. That is your stain.

( Warden Filter, Private notes to Bruce Wayne and the Seventh Doctor. )