The mind is what you think when you think no one knows what you think. That is the real heart. It is your emotions, how you really feel about God, your parents, husband/wife, children, self, job, circumstances in your life. That's the real heart.
And it's your real will - what you will choose to do in any given situation if there were neither restraint nor consequences. That's your heart and that's what God sees.
God desires that the heart be pure. Pure being;
- Increasingly free from hypocrisy.
- Increasingly motivated only by the love of Christ.
- Having a clear conscience before God and before others and with others.
- Single-minded - learning to reject the devil's lies and accepting the absolutes of scriptures as convictions.
- To have a clean thought life. The entirety of the process that goes on in the mind which include your secret desires, your fantasies, your imaginary conversations and your imaginary experiences.