Cobb: You're waiting for a train. A train that'll take you far away. You know where you hope this train will take you. But you can't know for sure. Yet it doesn't matter. Now, tell me why?
Mal: Because you'll be together!

 

I'm going to improvise. Listen, there's something you should know about me... about inception. An idea is like a virus, resilient, highly contagious. The smallest seed of an idea can grow. It can grow to define or destroy you.

Inception