I never knew you: depart from me, ye that work iniquity.

The Lukewarm and those vain of Understanding are warned here? Could it be that this verse warns us that if Jesus answerers our prayers and we subsequently do not fully repent and baptise he shall not acknowledge us on the day of resurrection but abolish us?

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.
MAT  7: 24  Therefore whosoever heareth these sayings of mine, and doeth them,
I will liken him unto a wise man, which built his house upon a rock:
MAT  7: 25  And the rain descended, and the floods came, and the winds blew, and beat upon that house; and it fell not: for it was founded upon a rock.

Who are those who perform miracles to us, believing to have performed these in his name?
a) Some of the lukewarm who, after God answered them many times still do not do as Jesus ordered us: to repent and baptise?
b) Some of those who God answered, but who subsequently turned, not persevering unto the end, as he demands? And note:
we all have a limit; my reach is not your reach. When God tries us, he will not exceed our limit of endurance, for else he shall lose us!
c) who they can be that believed to have performed miracles in the name of Christ whilst he declares not to know them:
 1 – those deluded, truly believing that Jesus answered them while, for example, they prayed to Mary, the mother of Jesus (Virgin Mary). Surely, Satan would love to deceive them by answering their prayer.
 2 – those who knowingly use other means  (tricks) to perform false miracles to people.