How do we know we are saved according to Reformed theology?

According to historic Reformed theology, salvation is solely an act of God's grace through faith. Ephesians 2:8-9 confirms that we are saved by grace through faith, not by works, ensuring that no one can boast about their own righteousness. The work of the Holy Spirit in the believer confirms this salvation, giving them a new heart and a desire to follow Christ. This transformative experience is evidenced by a life increasingly marked by faith and dependence on Christ, rather than reliance on one's own efforts.