2. He's admitting he had the same questions himself but the answer was obvious to him and he could accept it;

3. He's comforting Bernard in telling him he's no less alive because he understands what he is;

4. He's criticizing humanity for its own romanticized view of itself;

5. He's explaining that, from an individual's perspective, memories and feelings corresponding to the outside world are meaningless. We're all trapped inside a box and whatever happens inside the box matters much more than what happens outside of it;

(http://www.autoadmit.com/thread.php?thread_id=5649678&forum_id=2...id.#48534476)