Mathew 12:36-37

But I say to you that every idle word men may speak, they will give account of it in the day of judgment. For by your words you will be justified, and by your words you will be condemned.

Our speaking was designed first to be a creative force for the word, not just for conversation. This means idle words are words that don’t produce because they are not based on faith. When we speak contrary or in fear predicting a bad ending to a circumstance, we are speaking idle words. We are either justified by our faith words or condemned by idle words.