Mark 9:23
What does Mark 9:23 mean?
Jesus said to him, “If you can believe, all things are possible to him who believes.”
The short answer
Mark 9:23 comes at the raw center of a desperate scene. A father has brought his son, tormented since childhood by a spirit that throws him into fire and water. Jesus' disciples have already tried to help and failed. So when the father finally reaches Jesus, his plea is understandably hedged: if you can do anything, have compassion and help us. Jesus catches that hedge and hands it back: "If you can believe, all things are possible to him who believes."
It is a startling reply, and it can be misread. Jesus is not telling the man that healing is a prize for people who work up enough certainty, as though faith were a force we generate and God merely responds to. The "all things are possible" in this verse belongs to God's power, not to the believer's willpower. What Jesus challenges is the father's framing — the quiet assumption that Jesus' ability is the open question. The real question, Jesus suggests, is whether the man will trust him.
The father's answer in the next verse is one of the most honest prayers in the Bible: "I believe. Help my unbelief!" He does not pretend to a confidence he lacks. He offers the faith he has and asks for help with the rest — and Jesus heals his son. That is the verse's built-in safeguard: the faith that receives "all things" turns out to be imperfect, admitted, and dependent.
The story closes with one more guardrail. When the disciples ask privately why they failed, Jesus says this kind comes out only by prayer — and some ancient manuscripts add fasting. Belief, in other words, is not a technique to master. It is a posture of dependence on God, sustained by the ordinary practices that keep us leaning on him.
What scholars say
These excerpts answer two natural questions about the verse: R. T. France points out that Matthew has no parallel to Mark 9:23–24, marking this as the one place where faith is set before the person seeking help as an explicit condition of healing, while Thompson notes that some ancient manuscripts say the boy's cure was possible only through prayer and fasting — practices that invite God's power rather than our own.
“Acts 2:29–36 ; 13:22–23 ; Rom 1:3 ; 2 Tim 2:8 ), but the title "Son of David" seems to have a special resonance for Matthew. ... Faith has been mentioned as a key factor in previous healings, but this is the first time (and the only time in Matthew; he does not have a parallel to Mark 9:23–24 ) when it is explicitly set before the suppliant as a condition of healing. ... But these are the first people to have addressed Jesus as "Son of David" (i.e. Messiah), so the secrecy may have less to do with the healing itself than with their perception of Jesus' role (as with the "messianic secrecy" of 16:20 , and cf. 17:9 ).”
“Jesus combined prayer and fasting to overcome his temptations in the desert. The early church followed this practice at critical points in its life to discern how God was leading them and to empower their ministry (Acts 13; 14). Some ancient manuscripts indicate that Jesus’ cure of an epileptic boy (Mark 9:14–29) was possible only “by prayer and fasting.” These examples suggest that the combination of prayer and fasting invites a greater measure of God’s power to be released through us than might be possible through prayer alone.”
What it means for you
This verse gives you permission to come to God exactly as you are: partly trusting, partly afraid. You do not have to manufacture flawless confidence before you pray. The father's words — "I believe. Help my unbelief!" — are a prayer you can borrow on any hard day, and the story shows that Jesus honors it.
At the same time, Mark 9:23 warns against turning faith into a formula, as if enough positivity guarantees the outcome we want. The passage points instead toward prayer, and the humility of depending on God's power rather than our own. Faith is less a muscle to flex than a hand held open.
Mark 9 in context
Mark 9 opens on a mountaintop, where Peter, James, and John see Jesus transfigured in glory. This healing happens the moment Jesus comes back down: he finds a crowd, arguing scribes, and his remaining disciples embarrassed by a failed exorcism (9:14–29). The contrast is deliberate — dazzling glory above, human helplessness below. Verse 23 sits at the hinge of that scene. Afterward, Jesus predicts his coming death and resurrection, then corrects the disciples' argument about which of them is greatest, teaching that true greatness looks like being servant of all.