King pioneered a field of theology that he termed "covenant eschatology" which most call full preterism. Within fundamentalist and conservative Evangelical contexts, he contended that Biblical eschatology was not related to the end of the space-time universe, but to the transition of the Old Covenant to the New Covenant. King offered a unique interpretation concerning the millennium as found in Revelation 20 as pertaining to the forty-year period from 30-70 AD. He called this time "the transition period" from Old Covenant to New Covenant. In King's view, this transition opened the way for the full presence of God to dwell with all of humanity. To describe this relationship, King coined the phrase "Comprehensive Grace."
