How can we discern the state of a person's heart?

The state of an individual’s heart can be observed through their conduct and conversation, as Jesus teaches in Luke 6:45. The principle that 'out of the abundance of the heart his mouth speaks' indicates that our words and actions reveal our true spiritual condition. If one's lifestyle is characterized by ungodliness or worldliness, it reflects a graceless and unconverted heart. To undermine this principle, as commonly suggested, is contrary to Scripture and undermines the call to live a holy life in evidence of true faith.