How do we know that repentance is necessary for salvation?

Repentance is a vital part of the believer's experience, as seen throughout Scripture. Acts 3:19 states, 'Repent therefore, and turn back, that your sins may be blotted out.' This turning from sin is evidence of a heart that has been touched by God's grace. It demonstrates a recognition of one’s sinfulness and a desire to seek God's forgiveness. True repentance is not merely an emotional response but a deep, inward change that involves both a turning away from sin and a turning toward God. This transformation is initiated by the Holy Spirit, who works within the hearts of believers, granting them new desires and motivations to follow Christ.