And immediately the father of the boy, crying out with tears, said: "I do believe, Lord. Help my unbelief.
Other versions
King James Version
Jesus said unto him, If thou canst believe, all things are possible to him that believeth.English Standard Version
And Jesus said to him, "If you can! All things are possible for one who believes."New International Version
"'If you can'?" said Jesus. "Everything is possible for him who believes."