One of the major points of Calvinism is "the eternal security of the believer" or the "perseverance of the saints." It is also called "impossibility of apostasy," or simply "once saved, always saved." The doctrine teaches that it is impossible for a child of God to so sin as to fall from grace and be eternally lost. It is based on the belief that salvation is unconditional, so there is nothing a person can do to be saved; and once he is saved there is nothing he can do to be lost. What does the Bible teach about falling from grace?