Johnson's sceptical approach to biography is a dialectic by which Johnson engages the reader in testing the limits of biographical inference. This biographical scepticism derives from the scientific epistemologies of Locke and Bacon, the writings of Pierre Bayle, and the "constructive scepticism" of the seventeenth-century Christian apologists.
(1989). Samuel Johnson, Scepticism, and Biography. Biography: An Interdisciplinary Quarterly, 12 (4), 302-319.