Kyubey: You have no idea how much difficulty we go through trying to understand your human values. Presently there are six billion, eight hundred million of you, and you're increasing in number by a hundred every four minutes! What's the huge fuss over the death of each and every single creature? Madoka: If that's how you think of us, then yes, I see you are our enemy.
Miki-san... do you truly want that person's dream to come true? Or is it that you want to be that person's savior for making that dream come true? If you're going to fulfill someone else's dream, that's the time when it's most important to be sure you know your own wish. The two might seem the same, but they're entirely different.