The greatest evidence of man's freedom lies in his power to focus his attention on what he chooses. Thoughts are the material by which we live and work. Before anything else is accomplished of good or evil it is thought in the mind.
Thoughts are important.
An evil person thinks of evil things. A carnal person has all carnality in his mind. But a saved person thinks of good things. He has holy thoughts. Our thoughts are determined by the condition of our heart.