Known as both the Doctrines of Grace and the Five Points of Calvinism, these doctrines are Total Depravity, Unconditional Election, Limited Atonement, Irresistible Grace, and the Perseverance of the Saints. Read about each one at http://rsnbl.us/1M4uKbc
The question answered by the doctrine of limited atonement is this: Is Christ a real Savior or merely a "potential" Savior? The "L" of Tulip, is probably the most disputed term of the five. The idea that the atonement is "limited" provides the crux of the controversy. In other words, did Christ die to atone for sins of every human being, or did He die to atone for the sins of the elect only?
John Calvin (1509–1564) was an influential French theologian and pastor during the Protestant Reformation. He was a principal figure in the development of the system of Christian theology later called Calvinism. John Calvin was Martin Luther's successor as the preeminent Protestant theologian. Calvin made a powerful impact on the fundamental doctrines of Protestantism, and is widely credited as the most important figure in the second generation of the Protestant Reformation.
Martin Luther (10 November 1483 – 18 February 1546) was a German monk, priest, professor of theology and iconic figure of the Protestant Reformation. He strongly disputed the claim that freedom from God's punishment for sin could be purchased with money. He confronted indulgence salesman Johann Tetzel with his Ninety-Five Theses in 1517. His theology challenged the authority and office of the Pope by teaching that the Bible is the only source of divinely revealed knowledge from God.
The agent of predestination is God. In his sovereignty he predesignates. Human beings are the object of his predestination. In short, this refers to God's sovereign plan for human beings, decreed by Him in eternity. It also includes whatever comes to pass in time and space.