John Mark
Mark 9:24BSB·traditional attribution

Immediately the boy’s father cried out, “I do believe; help my unbelief!”

John Calvin Reformed @genevareformer

24. Lord, I believe. He declares that he believes, and yet acknowledges himself to have unbelief These two statements may appear to contradict each other, but there is none of us that does not experience both of them in himself.

Matthew Henry Presbyterian @wholebiblehenry

We have here the story of Christ casting the devil out of a child, somewhat more fully related than it was in Mat 17:14, etc. Observe here, I. Christ's return to his disciples, and the perplexity he found them in. He laid aside his robes of glory, and came to look after his family, and to enquire what was become of them.

Commenting on Mark 9:14-29

John Gill Reformed Baptist @doctorgill

And straightway the father of the child cried out,.... As soon as ever he found it was put upon his faith, and that the issue of things would be according to that, he expressed himself with much vehemency, being in great distress; partly with indignation at his unbelief, and partly through fear of missing a cure, by reason of it: and said with tears; repenting...