Quotes provided by @Rohni N
1. 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?
2. Saito: Have you come to kill me? I've been waiting for someone...
Cobb: Someone from a half remembered dream.
Saito: Cobb? Impossible. We were young men together. I'm an old man.
Cobb: Filled with regret...
Saito: Waiting to die alone...
Cobb: I've come back for you... to remind you of something. Something you once knew...
[the top spins without end]
Cobb: That this world is not real.
Saito: To convince me to honor our arrangement.
Cobb: To take a leap of faith, yes. Come back... so we can be young men together again. Come back with me...
[Saito reaches for the gun]
Cobb: Come back...
3. Cobb: [from trailer] Dreams feel real while we're in them. It's only when we wake up that we realize something was actually strange.
Other Inception Quotes
Cobb: What is the most resilient parasite? Bacteria? A virus? An intestinal worm? 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.
Ariadne: Why is it so important to dream?
Cobb: Because, in my dreams we are together.
Cobb: She locked away a secret, deep inside herself, something she once knew to be true... but chose to forget.