Every Calvinist misunderstands Calvinism. Only you, an anti-Calvinist, can properly explain it. That's the argument.
R.C. Sproul on Perseverance of the Saints
"This brings us to the P in TULIP. I’m sure you’ll be delighted to know that I’m not going to change this letter. The letter stands for the “perseverance of the saints.” However, even though I’m not changing the letter, I’m going to change the word. I think the catchphrase, perseverance of the saints, is dangerously misleading because it suggests that the persevering is something that we do, perhaps in and of ourselves.
I believe, of course, that saints do persevere in faith, and that those who have been effectually called by God and reborn by the power of the Holy Spirit endure to the end. They do persevere, but not simply because they are so diligent in making use of the mercies of God. The only reason we can give for why we continue in the faith until the last day is not because we have persevered so much, but because we have been preserved.
So, I prefer the term preservation of the saints because this process by which we are kept in a state of grace is something accomplished by God."