How does God give believers spiritual understanding?

According to the sermon, God actively regenerates His chosen, giving them spiritual understanding so they may know, believe, and understand Him. This process occurs when the Holy Spirit works in the hearts of believers, leading them to recognize their sinful state and the holiness of God. It is a transformative work where the believer is enlightened to the realities of Christ's redemptive work. Ephesians 1:17-18 emphasizes this divine illumination as Paul prays for the 'spirit of wisdom and revelation in the knowledge of Him.' Through this understanding, believers are equipped to testify of God's grace and the saving work of Christ, solidifying their faith and assurance.