Question: what does it mean when someone says not one iota?
Answer: The word is used in a common English phrase, "not one iota", meaning "not the slightest amount", in reference to a phrase in the New Testament (Matthew 5:18): "until heaven and earth pass away, not an iota, not a dot, (King James Version: '[not] one jot or one tittle') will pass from the Law until all is accomplished".