How do we know if someone is saved according to the Bible?

The assurance of salvation is rooted in the believer's trust in Jesus Christ alone for redemption, rather than in personal works or religious rituals. In the context of the sermon, Aaron's faith was not based on any of his accomplishments, but solely on the finished work of Christ. This demonstrates the essence of salvation as grounded in God's grace, as stated in Ephesians 2:8-9, where it emphasizes that we are saved by grace through faith, and that it is not of ourselves. A true believer will also have a heart transformed by grace, showing an affection for Christ and a desire to worship Him. This life change, brought about by the Holy Spirit, provides further evidence of one's salvation.