Full Idea
Twelfth mode: all reasoning leads on to further reasoning, and this process goes on forever.
Clarification
One of the 'modes of scepticism'
Gist of Idea
All reasoning endlessly leads to further reasoning (Mode 12)
Source
report of Agrippa (fragments/reports [c.60]) by Diogenes Laertius - Lives of Eminent Philosophers 09.Py.10
Book Reference
Diogenes Laertius: 'Diogenes Laertius', ed/tr. Yonge,C.D. [Henry G. Bohn 1853], p.412