Full Idea
Philosophy differs from dialectic in the manner of its powers, and from sophistry in the choice of life that it involves.
Clarification
'Dialectic' is a technique of argument, and 'sophistry' is false argument aimed at persuasion rather than truth
Gist of Idea
Philosophy has different powers from dialectic, and a different life from sophistry
Source
Aristotle (Metaphysics [c.324 BCE], 1004b17)
Book Reference
Aristotle: 'Metaphysics', ed/tr. Lawson-Tancred,Hugh [Penguin 1998], p.84
A Reaction
Note the separation of dialectic from the heart of philosophy, and the claim that philosophy is a way of life.