Jesus said it, "A good person produces good from the good treasure of his heart, and an evil person produces evil from an evil treasure, because the mouth speaks from the overflow of the heart." (Luke 6:45, NIV)
I'm afraid this is where I'm living at the moment. A person in my life is a HUGE disappointment because this person is exactly what this verse describes!
An evil heart cannot produce good treasure. An evil heart only produces evil treasure. That's the only possible overflow of an evil heart!
What is to be done with an evil heart? Is it a terminal condition? It doesn't have to be. The Gospel is all about turning evil hearts to good hearts. Only Jesus can change an evil heart!
The watching world watches the transformation and wonders. The watching world is captivated by the change. That's seeing the Gospel on "steroids" - changing hearts!
What is the measure of the heart condition? It's what comes from the mouth. It's what a person says backed up by their actions.
Jesus said we don't speak from a process created in our mind. We speak from our hearts and reveal thereby the condition of our hearts!
Just remember it's not a terminal condition when Jesus Christ is the One to whom we bow! That's the amazing wonder of His Gospel of grace!