Full Idea
Dialectic is the only field of inquiry whose quest for certainty causes it to uproot the things it takes for granted in the course of its journey.
Clarification
'Dialectic' is the impersonal pursuit of truth
Gist of Idea
Dialectic is the only method of inquiry which uproots the things which it takes for granted
Source
Plato (The Republic [c.371 BCE], 533c)
Book Reference
Plato: 'Republic', ed/tr. Waterfield,Robin [OUP 1993], p.266