Full Idea
In starting any thesis, it seems to me, one should put forward as one's point of departure something incontrovertible.
Gist of Idea
Start a thesis with something undisputable
Source
Diogenes (Apoll) (fragments/reports [c.440 BCE], B01), quoted by Diogenes Laertius - Lives of Eminent Philosophers 09.57
Book Reference
'Ancilla to the Pre-Socratic Philosophers', ed/tr. Freeman,Kathleen [Harvard 1957], p.87