The Doctrine of the Eons: God's Immutable Plan is an account of how God will bring about the salvation and reconciliation of all mankind. Each chapter provides a theological account of how this will be accomplished, including dispelling common myths about God and focusing on the meaning of the word "immutable." This leads to a discussion of the Hebrew and Greek definitions of "eon" and "eternal," and we discover that neither the Old nor the New Testament uses the word "eternal." "Eternal" tends to refer to an indefinite amount of time, whereas "eon" is more definite; the latter term is primarily used when the Bible talks about the end-times. Finally, the doctrine of universal salvation is presented, arguing that God will have all men be saved and that he will eventually reconcile all creation.