'I think this little catchphrase, perseverance of the saints, is dangerously misleading. It suggests that the perseverance is something that we do, perhaps in and of ourselves. I believe that saints do persevere in faith, and that those who have been effectually called by God and have been reborn by the power of the Holy Spirit endure to the end. However, they persevere not because they are so diligent in making use of the mercies of God. The only reason we can give why any of us continue on in the faith is because we have been preserved. So I prefer the term the preservation of the saints, because the process by which we are kept in a state of grace is something that is accomplished by God. My confidence in my preservation is not in my ability to persevere. My confidence rests in the power of Christ to sustain me with His grace and by the power of His intercession. He is going to bring us safely home'
R C Sproul