This is a new, fully revised, edited and updated edition of Michael Eaton's magisterial study of the biblical, theological, and historical dimensions of assurance in the life of a Christian believer. He challenges both traditional Arminian and Calvinist views, in which salvation and good works are too tightly bound together, by drawing a clear distinction between salvation and reward. He expounds a robust and radical grace—through which salvation overflows in assurance—based on a survey of select portions of the Old and New Testaments, and in dialogue with relevant writings by others. This edition includes a new section of three chapters in which Eaton responds in particular to the writings of Tom Wright on covenant.