Those who deny revelations or tongues or prophesying or say they are ceased know not the Gospel.  Often Latter-Day Saints will say similarly, "These were needed at the founding but they are not needed today."

"And again I speak unto you who deny the revelations of God, and say that they are done away, that there are no revelations, nor prophecies, nor gifts, nor healing, nor speaking with tongues, and the interpretation of tongues;  Behold I say unto you, he that denieth these things knoweth not the gospel of Christ; yea, he has not read the scriptures; if so, he does not understand them." (Mormon 9:7-8)