What does Mark 8:24 mean?
After Jesus healed the deaf man, the people declared, "He has done all things well" (Mark 7:37). When He healed the centurion's servant, the effect was instant (Matthew 8:13). His healing of Peter's mother-in-law appears to be immediate, as well (Mark 1:30–31). And He healed the woman with an issue of blood before He noticed she'd touched Him (Mark 5:25–34). But His exorcism of a legion of demons involved intense negotiations and a herd of pigs (Mark 5:1–13).The Bible doesn't say why some healings are immediate and some take a little time. One possible reason is that the more involved healings provide a metaphor for the spiritual healing of His disciples. They are beginning to see Jesus for who He is—and, indeed, Peter will soon declare Jesus to be the Christ (Mark 8:29)—but they have a way to go. They don't yet understand that the Messiah has come to save the world from sin, not the Jews from the Romans. And they're still confused about how Jesus can provide for their needs.
Sanctification is the process by which we grow in spiritual maturity and knowledge of Jesus. When we become believers, the Holy Spirit comes to dwell in us to teach us truth (John 16:13). We begin like the blind man, seeing Jesus as a tree, walking around. But as He works in us, we learn more about God and what He has planned for us.