Why is it important to confess with the mouth and believe in the heart?

Romans 10:9 states, 'If thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.' This passage underscores that true faith manifests itself in both internal belief and external confession. The act of confession is not simply a verbal acknowledgment; it reflects a deep, heartfelt conviction that Jesus Christ is Lord and Savior. This duality of belief and profession showcases a transformation that only God can effectuate in a believer's life, affirming that one's salvation experience is as much about the heart as it is about the tongue.