Quotes from quite possibly the most thought provoking movie ever made...

"What is real? How do you define real? If you are talking about what you can feel, what you can smell, what you can taste and see, then real is simply electrical signals interpreted by your brain."

Morpheus
Neo has just taken the red pill and has touched the mirror.

This is the world that you know. You have been living in a dream world. Welcome to the desert of the real."

Morpheus
Morpheus and Neo are in The Matrix, sitting in the deserted city.