… is from pages 165-166 of my late Nobel-laureate colleague Jim Buchanan’s important 1986 paper “The Potential for Tyranny in Politics as Science” (reprinted in Moral Science and Moral Order [2001], Vol. 17 of The Collected Works of James M. Buchanan):
There is simply nothing analogous to [scientific] truth in politics at all. There is no unique value “out there” that exists, or that should be thought to exist, apart from the individual valuations.