How does God communicate the truth of salvation to the believer?

Believers receive assurance of their salvation through the inward witness of the Holy Spirit, who testifies to our spirits that we are children of God (Romans 8:16). This inward affirmation is essential for true faith, as expressed in Psalm 35:3, where the psalmist seeks assurance from God, 'Say unto my soul, I am thy salvation.' This divine communication does not depend on human understanding or will but is established by God's sovereign grace, securing our hope in Christ alone. It instills peace and encourages believers to cast their cares upon Christ, trusting in His promises.