Arthur: Ah, what Mr Cobb is trying to...
Cobb: An idea. Resilient, highly contagious. Once an idea has taken hold of the brain it's almost impossible to eradicate. An idea that is fully formed, fully understood. That sticks, right in there somewhere. [points to his head]
Saito: For someone like you to steel?
Arthur: Yes in dream state your conscious defenses are lowered and it makes your thoughts vulnerable to theft. It's called extraction.
Ariadne: We're going to destroy his one positive relationship?
Eames: No, it repairs his relationship with his father, thus, exposing his godfather's true nature. We should charge Fischer a lot more than science for this job.