Human Nature in its Fourfold State is a 1720 book by Scottish Presbyterian theologian and philosopher Thomas Boston.
It was extremely popular and influential in 18th century Scotland.
[1] Boston organizes human nature into four aspects: Primitive Integrity, Entire Depravity, Begun Recovery, and Consummate Happiness or Misery.
[2][3] Sinclair Ferguson notes that "the book became virtually synonymous with the evangelical tradition in Scotland and could be found in many homes along with a family Bible, the Shorter Catechism, and a copy of John Bunyan's Pilgrim's Progress.
"[4] Philip Ryken notes that it was "the most frequently published Scottish book of the eighteenth century, going through nearly 60 editions by 1800 and over one hundred editions in all.