Susan and The Doctor in “The Sensorites”

Susan

[Regarding a possible future return to Gallifrey]: When will we get back, Grandfather?

I don't know, my dear. This old ship of mine seems to be an aimless thing. However, we don't worry about it, do we? Do you?

Susan

Sometimes I feel I'd like to belong somewhere, not just be a wanderer. Still, I'm not unhappy.

Good, good.