All is summed up by these quotes

Have you ever had a dream, Neo, that you were so sure was real? What if you were unable to wake from that dream? How would you know the difference between the dream world and the real world?
Morpheus: How did I beat you?
Neo: You... you're too fast.
Morpheus: Do you believe that my being stronger or faster has anything to do with my muscles in this place? Do you think that's air you're breathing now?
You have to let it all go, Neo. Fear, doubt, and disbelief. Free your mind.
Neo: What are you trying to tell me? That I can dodge bullets?
Morpheus: No, Neo. I'm trying to tell you that when you're ready, you won't have to.
Willpower is the key to Dream Control. All you need to realize is its your world to create.