Christians..Do you think all Christians will go to Heaven?

What did Jesus mean when He said many will say," We ate with you, prophesied in your name, and drove out demons in your name. Then Jesus said,"I will look at you and say, I never new you, go away from me you evil doers." That was probably misquoted because that's what I can recall, I'm not reading it directly from the Bible. But you get the picture. What did He mean Thank you.