David Hume Quote
All the sciences have a relation, greater or less, to human nature; and...however wide any of them may seem to run from it, they still return back by one passage or another. Even Mathematics, Natural Philosophy, and Natural Religion, are in some measure dependent on the science of MAN; since they lie under the cognizance of men, and are judged of by their powers and faculties.
A Treatise on Human Nature (1739–40), ed. L. A. Selby-Bigge (1888), introduction, xix