Philosophers

What was said

Lister: Kryten, there was a cartoon character once called Popeye, said a really profound thing.
Kryten: Well, what did he say?
Lister: He said, "I am what I am."
Kryten: Are you sure? I always thought it was Descartes!
Lister: So did I, man! It's so easy to get those two dudes mixed up!

I nods to the Raging Kraut