However things may have been in the past; fear is prohibited now. It is the demonic plan to use fear to gain their objectives - the public realm has been turned into a discourse of fear; therefore Christians cannot use it.
This is difficult, I personally fail and lapse often - but it is a deep truth: fear is prohibited, absolutely.
Therefore, Christians cannot use fear to persuade, or to warn. I think we all feel this to be a fact of life?
We cannot use arguments of the If-Then type that depend on inculcating fear to avoid something - even if such arguments are effective in changing behaviour in the desired direction, the overall consequences of the argument having done so by the use of fear will more than negate any such benefit.
We must be able to present our Christian message without threats: we Just Must. It is the use of fear to manipulate that characterises our modern totalitarian world; but the use of fear is built-into the deep assumptions of The System; thus it is deniable and denied.
Anyone coming from outside the system, like Christians, who need to challenge the deep assumptions; can only hope to succeed in improving things overall if the outcome is a reduction in fear. The old method of inculcating 'holy dread', fear of hellfire' - then showing the way to escape... well, that will not do At All.
Not least because, in the current climate of endemic fear, to be effective the Christian would need to threaten something that induced even more fear than the high background level of fear. This would entail first convincing people of a world of premised upon more terrifying assumptions, greater dread and worse horrors than the modern media public realm... Well, you can see where this is going.
This is perhaps why the Fourth Gospel should be our Bible - since (with only a few and dubious exceptions among its many verses) here we get Jesus bringing and offering a positive addition to human life.
The Jesus of the Fourth Gospel does not argue by threats nor by inducing fear; not by threatening 'or else!'; but by offering something better than people already have, something wonderful - and simple: Heavenly eternal life.
And what should we do to get it? Simple. We get it by 'believing-on' Jesus, knowing he is the Son of God; by loving and following him through death into Life Everlasting, as a lost sheep follows a Good Shepherd.
We must not be drawn into the If Not side of things, the 'what will happen if I Don't follow Jesus', 'what will happen if I can't or won't believe he is the Son of God?' The simple answer is that Jesus has made an offer - and if you want it, you can have it. If you don't want it; well, you are not compelled to take it.
But what happens then - people will ask. What happens to me if I choose to reject Christ's offer/ The exact answer is not made explicit in the Fourth Gospel, and the outcome probably will vary from person by person; so each must work-out the answer for himself.
If not? The proper answer is a shrug?... You Tell Me?...
The mission is simply to tell what Jesus positively offers, what he adds to our earthly mortal lives, the cosmic, eternal, loving perspective... And what to do about it. Assuming that is what you want.