This doctrine, usually associated with Calvinism, suggests that one’s salvation is accomplished independent of one’s own decision. In this construct, God decides who be saved…and, in His grace, saves them. This gracious act is considered by some to be irresistible. That is, that it cannot be resisted or undone.
While this doctrine has implications that are directly taken from the Bible, it’s not a settled issue. The idea that humanity is able to exercise free will in rejecting God also comes from Scripture.