The Lord wishes that ALL come to the saving faith through His Son ... but He KNOWS that they “all” won’t. That states his intent but it doesn’t state the actual outcome.
According to the ACTUAL OUTCOME there are many for whom it is TOTALLY USELESS. Again ... that’s the outcome, and not the stated “desire”.
It’s easy to tell who is USELESS in that regard and who is not. The ones who are actually teaching and propagating these false “doctrines of demons” ... and bringing others into this cult group are the ones who are of their father the Devil. They are actively recruiting and bringing others into the cult and defending these doctrines of demons.
Keep in mind, that in defending and propagating these evil doctrines they have BEEN GIVEN the true Word of God SO MANY TIMES, it’s WAY PAST the point of whether they have heard or not. We are NOT RESPONSIBLE to “make sure” that someone else BELIEVES the true Word of God, we’re only responsible to give the person this message of the Gospel. And of that person “has been given” that Gospel ... the JOB IS DONE as far as our part.
Too many people seem to think it’s not only their part to give them the Gospel ... BUT ... it’s also their responsibility to MAKE SURE THEY BELIEVE IT.
SO ... with these people who are actually teaching and recruiting and propagating these Doctrines of Demons ... they have not just heard the Gospel once, they have not just heard it twice, and they have not just heard it 100 times ... they could actually repeat it back to you exactly as you give it to them! The problem is NOT that they have not been given the Gospel, it’s that they have totally rejected it and are actively propagating the Doctrines of Demons and bringing more into the cult group.
It is TOTALLY USELESS to “give them the Gospel” ... not because they should not be given the Gospel, but that they have been given it 100 times and more and they have chosen the Devil as their Father, instead!
That is why it is useless.
AGAIN ... the duty is to give the Gospel to people ... but NOT to force them to believe. You can’t do that and you can’t “save them” and “saving them” is not your responsibility anyway. That’s God’s responsibility.
So once that person who has been given the Gospel, your job is done as far as that responsibility is concerned.
Now with others, they are not like that. They are not propagating the doctrines of demons but they have been deceived into believing those false teaching and doctrines. They are willing to find out who Jesus is and what he has done in order to effect their salvation and they will listen. They will not be recruiting others into the cult and insisting on continuing to propagate these Doctrines of Demons. They will not be rejecting the Gospel that they are being presented. They are not useless. But even with them, you are not “saving them” even when presenting the Gospel ... it is God who saves, it is God who opens their hearts (not you) and it is God who hardens them (others), just like he did with Pharaoh.
When I am asked, “Why didn’t you present the Gospel to them.” I can say, “I did and they rejected it!” If someone asks further, “why didn’t you keep pestering them until they gave in?” ... I can say, “That’s not my job!”
To sum it all up, I can tell you in about five minutes of posting WHO you’re wasting your time with ... I can present the Gospel and if they reject it ... YOU ARE WASTING YOUR TIME!
You have done exactly what you are supposed to do (in five minutes or less) and you have NO RESPONSIBILITY to harangue them or force them to believe (even of you could, which you can’t). FURTHERMORE, I can pretty well tell you that those same people who will reject it from you (in you giving them the Gospel) will have rejected it a hundred times before, and it’s not any Biblical command that you must force them to believe or harangue them into believing.
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HOWEVER ... and as I said before ... in a group situation or on a forum, it is “useful” talking to those who are USELESS ... only because OTHERS are reading and they are listening.
Those people who have already REJECTED the Gospel are TOTALLY USLESS and they are LOST and are definitely on their way to the lake of fire and there is nothing you can do about it - and there is nothing you are supposed to do about it, other than what you did in presenting the Gospel. THEY are GONE!
“YOU” can do absolutely nothing about it, although God “may” at some future time, but that’s not “you” ... that’s God.
So, it’s those OTHERS who are reading and “listening” and “accepting” who can benefit!
It's not for ME to make such a JUDGMENT call.
"Go ye into ALL the world..." is quite clear to me.