Every good Calvinist believes that you have to endure to the end to be saved ( hence the P in TULIP) of course due to the U , every Calvinist will endure to the end because he is ' elect ' . The problem is he can never know he really is one of the elect unless he perseveres in good works . Now your caught in a works trip . Thats my point .
Your mistake, is in thinking the Reformed person must persevere in their own strength. If that was true, it would be a works gospel, I agree!
But we cannot persevere in our own strength. The Holy Spirit is the one who called and elected us, and he will help us persevere. And if we don't persevere, we never really were the elect.
"They went out from us, but they did not really belong to us. For if they had belonged to us, they would have remained with us; but their going showed that none of them belonged to us." 1 John 2:19
"But you have an anointing from the Holy One, and all of you know the truth. 21 I do not write to you because you do not know the truth, but because you do know it and because no lie comes from the truth." 1 John 2:20-21
"As for you, see that what you have heard from the beginning remains in you. If it does, you also will remain in the Son and in the Father. 25 And this is what he promised us—eternal life." 1 John 2:24-25
John is very firm, that God saved us! We are anointed by the Holy One, and we remain in the Son and the Father. They are the ones who saved us when we were dead in our sins, and they will help us persist to the end. Not works at all!
I know I would have walked away from God many times, especially when I was sick, and felt alone and abandoned. But God never left me, and he used my suffering to help me grow. Paul says it all;
"Not only so, but we also glory in our sufferings, because we know that suffering produces perseverance; 4 perseverance, character; and character, hope. 5 And hope does not put us to shame, because God’s love has been poured out into our hearts through the Holy Spirit, who has been given to us." Romans 5:3-5
It is always the Holy Spirit leading and guiding, helping us persevere, grow in character, through God's love through the Holy Spirit!