What does it mean that God speaks to the heart?

When it is said that God speaks to the heart, it means He communicates His truth and grace through His Word. This internal, transformative communication awakens individuals to their need for salvation and their true condition before Him. It's not merely an audible voice, but a profound understanding and conviction within the spirit, as illustrated in John 16:8, where the Holy Spirit convicts of sin, righteousness, and judgment. This divine revelation awakens the sinner, leading them to recognize God's holiness and their need for Christ as their only hope for redemption.