Could you show me the verse where it says we are sealed for the day of redemption unless we grieve the Holy Spirit .
This is how it appears your reading the bible.2 cor 13.12 Greet one another with a Holy kiss , or else you will be destroyed " .
rom 8.35 35Who shall separate us from the love of Christ? well you can if you upset the Holy Spirit .
38For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come,
39Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord ...unless you forget to confess a sin .
John 10.28
And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand....
But you can easily jump out of my hand ,so beware .
Just name any verse that's sounds remotely hopeful and just insert your own interpretation.