How do we know that God opens the eyes of the spiritually blind?

God’s promise to open the eyes of the blind is vividly depicted in Isaiah 42:16, where He assures us that He will guide those who cannot see. This is echoed in the New Testament with the miracle of Jesus giving sight to the blind man in John 9, illustrating that such acts reveal His identity as the Messiah. Moreover, many believers testify to this transformative experience, having gone from spiritual darkness to light. This change signifies the power of the gospel and the work of the Holy Spirit in bringing about a new birth, as expressed in Ephesians 2:8, where it is emphasized that by grace we are saved through faith, not of ourselves.