How do we know that Christ gives spiritual sight?

Christ’s ability to grant spiritual sight is affirmed throughout Scripture, where He fulfills prophecies regarding His mission to open the eyes of the blind. Isaiah 42:6-7 describes Him as a light to the Gentiles, to 'open the blind eyes.' This is realized in the lives of believers who testify that they were once blind but now see, echoing John 9:25, where the man born blind confesses his transformation. Moreover, the gradual process in which the blind man in Mark 8 received his sight illustrates how Christ works in our hearts over time, leading us to a clearer understanding of our need for Him and what He has accomplished. The ultimate witness is the change in believers’ lives, illustrating that He does grant spiritual sight.