The reformation's TULIP is for Total Depravity, Unconditional election, Limited atonement, Irresistible grace and Perseverance of the saints.
While going through my father's things years ago I found a little slip of paper with TULIP spelled out.
What was so exciting the was his description of which I have never read before or after!
He wrote after "P" "perseverance of God in the saints.
This simple addition was so exciting, not only because it was unique but because it is the truth of scripture backing it. .
Without God guaranteeing our "finishing well" we are on our own to make sure that happens.
"Therefore my dear friends, as you have always obeyed- not only in my presence , but now much more in my absence - continue to work out your out your salvation with fear and trembling, for it is God who works in you to will and to act according to his good purpose."
"And those he predestined, he also called,those he called, he also justified, he also glorified."
I have written about this before-- one is either in the kingdom or not. One is either a Christian or he is not. There are no in between stages.
Also I Corinthians 3:16, I Corinthians 6:19, Galatians 3:20
"P" is for Perseverance of God in his saints. We can trust God to have us persevere in our faith!! Now what that may look at we don't know....only God knows.