According to Matthew 5:22 (NASB), "But I say to you that everyone who is angry with his brother shall be answerable to the court; and whoever says to his brother, ‘You good-for-nothing,’ shall be answerable to the supreme court; and whoever says, ‘You fool,’ shall be guilty enough to go into the fiery hell." So, who is a fool? According to Psalm 14:1 the only person who is considered a fool is the person who says there is no God. If you call anyone else a fool, especially a brother or sister it is the same as judging the belief of their heart and you are in danger of judgement. The Bible takes this very serious and so should we.