"Will never" is the point in question.
Notice that Paul himself does not believe the verse can be bent to mean that there is no possibility of the saints turning from the right course and listening to error.
2 Cor 11
3 But I fear, lest somehow, as the serpent deceived Eve by his craftiness, so your minds may be corrupted from the simplicity that is in Christ. 4 For if he who comes preaches another Jesus whom we have not preached, or if you receive a different spirit which you have not received, or a different gospel which you have not accepted—you may well put up with it!
Acts 20
28 Therefore take heed to yourselves and to all the flock, among which the Holy Spirit has made you overseers, to shepherd the church of God which He purchased with His own blood. 29 For I know this, that after my departure savage wolves will come in among you, not sparing the flock. 30 Also from among yourselves men will rise up, speaking perverse things, to draw away the disciples after themselves. 31 Therefore watch, and remember that for three years I did not cease to warn everyone night and day with tears.
And of course we all know the apostasy that took place in the dark ages.
Hence my remarks in my previous post -noticing these applicable texts.
in Christ,
Bob