Mat 7:21 Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
Mat 7:22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
Mat 7:23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
In the passage at hand, Jesus used the verb translated "saith" which means they continuously utter or proclaim these words. There are some people in the world that claim to be Christians, and do so on a very regular basis. But, in contrast to those people, Christ says that the only person who will be accepted into the dwelling place of God, Heaven, will be those who don't just proclaim to be Christians on a regular basis, but those who actually do the works commanded by him on a regular basis as well. Notice all the works those who are discussed actually did do! However, if a person only attempts to live the Christian life, or only does certain aspects of it, it is as if he never even tried in the first place and Christ will be a stranger to them.
Much like the people breaking into Facebook accounts, these types of people profess to be something that they have only stolen the password for. They become Christians by following the plan set forth by God, but that is it. If the Christian counterparts to these hackers would simply take on the whole role of Christians and follow the Lord's commands, there would be no Christian hackers and Christ would not have to delete people from His divine "friends list," i.e. the Book of Life, and would be a stranger to no one.
Let's not be Facebook phonies or phonies of any kind, much less the spiritual kind!