SEV Biblia, Chapter 9:29
Y les dijo: Este gnero con nada puede salir, sino con oracin y ayuno.
Clarke's Bible Commentary - Mark 9:29
Verse 29. Prayer and fasting.] See on Matt. xvii. 21. This demon may be considered as an emblem of deeply rooted vices, and inveterate habits, over which the conquest is not generally obtained, but through extraordinary humiliations.
This case is related by both Matthew and Luke, but it is greatly amplified in Mark's account, and many new circumstances related. Another proof that Mark did not abridge Matthew.
John Gill's Bible Commentary
Ver. 29. And he said unto them , etc..] Matthew, besides the following reason, assigns another, as given by our Lord, why they could not cast out the foul spirit, which was their unbelief; of which they were guilty in some sort, as well as the Jews, and the father of the child; but Mark omits it, and only relates this as the reason; this kind can come forth by nothing, but by prayer and fasting ; which they had not observed; (see Gill on Matthew 17:21).
Matthew Henry Commentary
Verses 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 cans believe, it is possible that thy hard heart may be softened, the 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 loo 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 Sata 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 his 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 tha ordinary pains.
Greek Textus Receptus
και 2532 CONJ ειπεν 2036 5627 V-2AAI-3S αυτοις 846 P-DPM τουτο 5124 D-NSN το 3588 T-NSN γενος 1085 N-NSN εν 1722 PREP ουδενι 3762 A-DSN δυναται 1410 5736 V-PNI-3S εξελθειν 1831 5629 V-2AAN ει 1487 COND μη 3361 PRT-N εν 1722 PREP προσευχη 4335 N-DSF και 2532 CONJ νηστεια 3521 N-DSF
Robertson's NT Word Studies
9:29 {Save by prayer} (ei me en proseucei). The addition of "and of fasting" does not appear in the two best Greek manuscripts (Aleph and B). It is clearly a late addition to help explain the failure. But it is needless and also untrue. Prayer is what the nine had failed to use. They were powerless because they were prayerless. Their self-complacency spelled defeat. #Mt 17:20 has "because of your little faith" (oligopistian). That is true also. They had too much faith in themselves, too little in Christ. "They had trusted to the semi-magical power with which they thought themselves invested" (Swete). "Spirits of such malice were quick to discern the lack of moral power and would yield to no other" (_ibid_.).
