Reasons why demons may not come out after trying to cast them out

Summary

If someone tries to cast demons out of a subject but the demons do not seem to come out, there can be reasons for that:

On the part of the one trying to cast out demons: 

1) It is possible to misdiagnose the subject by thinking that the subject needed demons to be cast out when it is not the case.

2) It is possible that the way the demons are attempted to be cast out is not appropriate.

3) Casting out demons may not necessarily happen instantly. 

4) A kind of demon could require someone casting it out to be strong.

On the part of the subject needing demons to be cast out of them:

1) Faith can be expected from someone asking for a demon to be cast out.

2) Repentance may be expected from someone asking for a demon to be cast out.

You can find more details below:

It is possible for demons to not come out after trying to cast them out

There are examples in the Bible of people trying to cast out a demon and not managing to cast it out. 

For example, it is written that a man said to Jesus: "I-brought my son having (a) mute spirit to You" (Mark 9:17), "And I-spoke (to) Your disciples in-order-that they-might-cast it out, and they-were not strong-(enough)”." (Mark 9:18). 

Another example: it is written that "some (of) the Jewish exorcists going-around attempted to-name the name (of) the Lord Jesus over the (ones) having the evil spirits, saying, “I-adjure you (by) the Jesus Whom Paul is-proclaiming”. Now there-were seven sons (of a) certain Sceva, (a) Jewish chief-priest, doing this. But having-responded, the evil spirit said (to) them, “I-know Jesus and know-about Paul, but who are-you?” And the man in whom was the evil spirit — having-leaped on them, having-subdued both (of them) — prevailed against them, so that (they) fled out-of that house naked and having-been-wounded" (Acts 19:13-16).

There can reasons for a demon to not come out after trying to cast it out.

Reasons from the one trying to cast out demons:

1) Misdiagnosing

Someone could misdiagnose a subject by thinking that they need demons to be cast out when it is not the case. Before trying to cast out demons one can check if there is a need for a demon to be cast out.

For more information:

What can be done to find out if there is a need for a demon to be cast out?:
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2) Not having an appropriate way to cast out demons

The way that someone may be trying to cast out demons may not be appropriate. One way that is appropriate according to the Bible is for example by commanding the demons directly to come out.

For more information:

Casting out demons - by commanding the demons directly:
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3) Demons may not come out instantly

It may be possible that demons may not come out instantly. In such case, if the person trying to cast them out would stop just after trying once, they would not end up seeing the demons coming out.

For more information:

Casting out demons - may not necessarily happen instantly:
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4) A kind of demon could require someone casting it out to be strong

A kind of demon could require someone casting it out to be strong.

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Could a kind of demon require someone casting it out to be strong?:
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Reasons from the subject needing demons to be cast out from them:

1) Faith can be expected

Faith can be expected from someone asking for a demon to be cast out.

For more information:

Faith can be expected from someone asking for a demon to be cast out:
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Furthermore, casting out demons can be considered a miracle. A miracle can require faith from someone receiving it. 

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Casting out demons - can be considered a miracle:
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If casting out demons can be considered a miracle, and if a miracle can fail to happen if the subject does not believe, then it could be possible to infer that casting out demons could fail to happen if the person receiving would not believe. 

This could be what would have happened when Jesus went somewhere and "He-was not able to-do any miracle there — except, having-laid (His) hands on (a) few sick (ones), He-cured (them). And He-was-marveling because-of their unbelief" (Mark 6:5-6). 

Jesus was "not able to-do any miracle there" (Mark 6:5) and "He-was-marveling because-of their unbelief" (Mark 6:6). There are no mentions of Jesus casting out demons there, which could have been considered a "miracle" (Mark 6:5). Could this be "because-of their unbelief" (Mark 6:6)? If so, this may be additional evidence for why faith can be expected from someone asking for a demon to be cast out (which unbelief could prevent from happening in that case). 

2) Repentance may be expected

Repentance may be expected from someone asking for a demon to be cast out.

For more information:

Repentance may be expected from someone asking for a demon to be cast out:
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