Full Idea
It is not possible either to seek or to doubt without a preconception.
Gist of Idea
Reasoning is impossible without a preconception
Source
Sextus Empiricus (Against the Ethicists (one book) [c.180], II.22)
Book Reference
Sextus Empiricus: 'Against the Physicists/Against the Ethicists', ed/tr. Bury,R.G. [Harvard Loeb 1997], p.395
A Reaction
[Sextus quotes this from 'the sapient Epicurus'] I think this may be a message across the centuries to Hegel, who attempted this impossible feat. My picture of philosophy is a continual shift of the preconceptions, to explore thoroughly.