Let me tell you this: on judgment day people will have to own up to every trivial word they say. Yes: you will be vindicated by your own words – and you will be condemned by your own words.”
Jesus, from Matthew 12:36-37 Kingdom New Testament
Their speech – and remember that they had just accused Jesus of black magic – will show what’s really in their hearts. Casual words always reveal deep attitudes; Jesus said it long before Sigmund Freud did (in the famous ‘Freudian slip’, the secret someone is trying to hide pops out of their mouth before they can stop it). As a result, casual words will be used on the day of judgment as a reliable indicator of what really matters, the state of the heart.