that chapter he is speaking to his disciples at the last supper.....he knew they would be tempted to leave him, ..Jesus is the tree ( root) he will nourish us, prune us, cut off dead limbs (....persay) the ones that do not bear fruit( go through the actions of a Christians, yet not even saved) do NOT bear fruit, if they do not bear fruit they are not of the tree..dead if they were really by faith accepted Christ they would produce fruit. , they outwardly look like they are Christians, but they never had him come into their life. ....there are church member...I mean MEMBERS....that have dry bones inside, have no fruits and do not have Christ. just outward appearance . the outward person that SAYS they are Christians, yet are not his, are like a branch that withers.....no fruits, they die out and SUCH branches are thrown into the fire...of course they are they are not his.
Is that mean there is posibility to leave Him or lost their salvation isn't It?
If there No posibility to leave why bother to warn?