This shows that the gift of tongues is intended as a sign not to those who believe but to unbelievers, but prophecy is intended not for unbelievers but for those who believe.
that servant's Master will come on a day when he is not expecting Him and at an hour that he knows not of, and will punish him severely, and make him share the lot of the unfaithful.
and remembers that a law is not enacted to control a righteous man, but for the lawless and rebellious, the irreligious and sinful, the godless and profane–for those who strike their fathers or their mothers, for murderers,