Full Idea
When a man said that he was not suited to philosophy, Diogenes said to him, 'Why then do you live, if you have no desire to live properly.'
Gist of Idea
Diogenes said avoidance of philosophy is the lack of a desire to live properly
Source
report of Diogenes (Sin) (reports [c.360 BCE]) by Diogenes Laertius - Lives of Eminent Philosophers 06.Di.6
Book Reference
Diogenes Laertius: 'Diogenes Laertius', ed/tr. Yonge,C.D. [Henry G. Bohn 1853], p.241
A Reaction
Meaning philosophy is already more practice than theory.