Mark 9:28

28 After Jesus had gone into the house, His disciples asked Him privately, “Why couldn’t we drive it out?”

Mark 9:28 Meaning and Commentary

Mark 9:28

And when he was come into the house
Perhaps into the man's house whose child he had healed, or into some other in these parts, for the sake both of retirement and refreshment:

his disciples asked him privately, why could not we cast him out?
The nine disciples, who were particularly concerned in this matter, fearing they had lost the power of casting out devils, conferred upon them, inquired of Jesus, when he was alone, why they could not cast the demon out of the child, when they had ejected unclean spirits out of many others; (See Gill on Matthew 17:19).

Mark 9:28 In-Context

26 After shrieking and convulsing him violently, the spirit came out. The boy became like a corpse, so that many said, “He is dead.”

27 But Jesus took him by the hand and helped him to his feet, and he stood up.

28 After Jesus had gone into the house, His disciples asked Him privately, “Why couldn’t we drive it out?”

29 Jesus answered, “This kind cannot come out, except by prayer.”

30 Going on from there, they passed through Galilee. But Jesus did not want anyone to know,