As with everything that is godly and righteous, true fruit bearing begins on the inside, in the heart. Paul speaks of our “having been filled with the fruit of righteousness which comes through Jesus Christ” (Philippians 1:11) and informs us that “the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, self-control” (Galatians 5:22–23).
A person who belongs to Jesus Christ and who is called by God and given God’s message will give evidence of good fruit both in his attitudes and his actions. A person who does not belong to God, especially a false prophet who claims to be God’s messenger, will sooner or later manifest the bad fruit that the bad tree of his sensual life inevitably produces.
False prophets can disguise and hide their bad fruit for a while with ecclesiastical trappings, biblical knowledge, and evangelical vocabulary. They can cover it by belonging to Christian organizations, associating with Christian leaders, and by talking about divine things. But how they talk, act, and react when not in the view of Christians will eventually expose their true loyalty and convictions. What is in the heart will emerge, and corrupt theology and unscrupulous behaviour will result in a corrupt life. False teaching and perverted living are inseparable, and eventually will become manifest.