When he saw him the spirit tare him; and he fell on the ground, etc. - When this demon saw Jesus, he had great rage, knowing that his time was short; and hence the extraordinary convulsions mentioned above.

And they brought him unto him,.... The father of the child, and those that were with him, brought the child to Jesus, into his presence, before him:

and when he saw him, that is, either when Jesus saw the child, or the child saw Jesus; or the evil spirit in him, and by him which were all at once:

straightway the spirit tare him; threw him into a violent fit, shook him, and convulsed him in a dreadful manner; knowing his time was short, and being filled with indignation and rage, that he should be obliged, as he knew he must, to leave the child very speedily; and was therefore resolved to do all the mischief, and put him to all the pain he could:

and he fell on the ground; at the feet of Jesus, not being able to stand, through the violent motions and convulsions he threw him into:

and wallowed, foaming; rolled about from side to side, foaming at the mouth, and in the most exquisite rack and torture.

Mark is more specific in his detail of the convulsion which seized the lad as he was coming to Jesus. He notes the convulsion as coming on at the demoniac's sight of our Lord. "When he saw him, straightway the spirit," etc. Also his falling on the ground, wallowing and foaming. We might expect the detail of these symptoms in Luke, the physician.

And they brought him unto him: and when he {g} saw him, straightway the spirit tare him; and he fell on the ground, and wallowed foaming.

(g) As soon as Jesus had looked upon the boy that was brought to him, the demon began to rage in this way.

9:20 When he saw him - When the child saw Christ; when his deliverance was at hand. Immediately the spirit tore him - Made his last grand effort to destroy him. Is it not generally so, before Satan is cast out of a soul, of which he has long had possession?

20. And they brought him unto him: and when he saw him, straightway the spirit tare him-Just as the man with the legion of demons, "when he saw Jesus, ran and worshipped Him" (Mr 5:6), so this demon, when he saw Him, immediately "tare him." The feeling of terror and rage was the same in both cases.

and he fell on the ground, and wallowed foaming-Still Jesus does nothing, but keeps conversing with the father about the case-partly to have its desperate features told out by him who knew them best, in the hearing of the spectators; partly to let its virulence have time to show itself; and partly to deepen the exercise of the father's soul, to draw out his faith, and thus to prepare both him and the by-standers for what He was to do.

9:14-29 The father of the suffering youth reflected on the want of power in the disciples; but Christ will have him reckon the disappointment to the want of faith. Very much is promised to our believing. If thou canst believe, it is possible that thy hard heart may be softened, thy spiritual diseases may be cured; and, weak as thou art, thou mayest be able to hold out to the end. Those that complain of unbelief, must look up to Christ for grace to help them against it, and his grace will be sufficient for them. Whom Christ cures, he cures effectually. But Satan is unwilling to be driven from those that have been long his slaves, and, when he cannot deceive or destroy the sinner, he will cause him all the terror that he can. The disciples must not think to do their work always with the same ease; some services call for more than ordinary pains.