 Peirce insisted that (1) in reasoning, there is the presupposition, and at least the hope, that truth and the real are discoverable and "would" be discovered, sooner or later but still inevitably, by investigation taken far enough, and (2) contrary to Descartes' famous and influential methodology in the "Meditations on First Philosophy", doubt cannot be feigned or created by verbal "fiat" to motivate fruitful inquiry, and much less can philosophy begin in universal doubt.Doubt, like belief, requires justification.Genuine doubt irritates and inhibits, in the sense that belief is that upon which one is prepared to act.