How do we know that Christ dwells in the hearts of believers?

The assurance of Christ dwelling in the hearts of believers comes from Romans 10, which speaks of faith being both in the mouth and the heart. When individuals confess with their mouths that Jesus is Lord and believe in their hearts that God raised Him from the dead, they are promised salvation. This indicates a spiritual union with Christ, whereby He resides in the hearts of His people by faith. Furthermore, Ephesians 3:17 reinforces this truth by stating that Christ may dwell in our hearts through faith, suggesting that our true connection to God is relational, rather than physical.