You can be confident that that is God's purpose and yet Paul knew full well that it's still contingent on our remaining in Him. That's why we're told to remain in Him, and to strive, to be vigilant, persist in doing good, make effort, persevere, etc , etc. Again, both carrots and sticks are offered. Some people don't want to hear about those nasty sticks even if they' exist for their own good. Wouldn't want to think God would actually place any demands or obligations on us poor little believers that we might need to be cognizant of. But go ahead and ignore Scripture where it doesn't fit with your preferences.
"If some of the branches have been broken off, and you, though a wild olive shoot, have been grafted in among the others and now share in the nourishing sap from the olive root, do not consider yourself to be superior to those other branches. If you do, consider this: You do not support the root, but the root supports you. You will say then, “Branches were broken off so that I could be grafted in.” Granted. But they were broken off because of unbelief, and you stand by faith. Do not be arrogant, but tremble. For if God did not spare the natural branches, he will not spare you either. Consider therefore the kindness and sternness of God: sternness to those who fell, but kindness to you, provided that you continue in his kindness. Otherwise, you also will be cut off." Rom 11:17-22
Jesus had a pretty good idea about it as well:
“I am the vine; you are the branches. If you remain in me and I in you, you will bear much fruit; apart from me you can do nothing. If you do not remain in me, you are like a branch that is thrown away and withers; such branches are picked up, thrown into the fire and burned." John 15:5-6
If you've got the fruit, then you should have more confidence.