How do we know false prophets are among us?

Jesus teaches in Matthew 7:16, 'Ye shall know them by their fruits.' This means that the true nature of a prophet will be evident in the fruits of their ministry, particularly in what they teach. A false prophet may display outward signs of piety but will ultimately lead people away from the truth of the gospel. They tend to teach doctrines that broaden the way of salvation or omit essential truths, such as the sinfulness of man and the necessity of Christ's sacrifice for salvation. Thus, careful evaluation of their doctrine is crucial in distinguishing true ministers of the gospel from false ones.