Last Generation Theology (LGT) or "final generation" theology is a belief system of overcoming sin held by some members of the Seventh-day Adventist Church, which claims that perfection will be achieved by sanctified people in the last generation before the Second Coming of Jesus much like the 144000 described in the Book of Revelation of the New Testament. In Seventh-day Adventist theology, there will be an end time remnant of believers who are faithful to God, which will be manifest shortly prior to the second coming of Jesus. Some claim it is related to "historic Adventism", but as one supporter claims, it differs in that it forms an extension or development of "historic" or mainstream Adventist beliefs, or takes them to their logical conclusion. It has similarities to the teachings of John Wesley in his .
Adventists teach that Jesus Christ was not only the Substitute but also the Example for man, and that Christians through the process of sanctification, the character of Christ is perfectly reproduced in them through the Holy Spirit. But "final generation" believers feel that Gods people will lose all attraction to sin, and cease from it out of a intensifed abhorrence resulting from a full conviction of truth, achieved by the illumination of the Holy Spirit. This is fully developed just prior to the close of human probation and before the great "Time of Trouble" described prophetically (Daniel 12:1; Jeremiah 30:7; Isaiah 26:20). A period of "last plagues" or judgments effects an ultimate trial for both groups, decidedly demonstrating the complete and permanent acceptance or rejection of God's authority for all yet living, which leaves no further purpose for additional probationary grace or delay of Christ's Second Coming.