Diogenes Laërtius, vi. 44 
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Diogenes of Sinope: Doing
Diogenes of Sinope was ancient Greek philosopher, one of the founders of the Cynic philosophy. Explore interesting quotes on doing.
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                                        Diogenes Laërtius, vi. 64 
Quoted by Diogenes Laërtius
                                    
                                        
                                        Porphyry,  On Abstinence from Killing Animals https://books.google.it/books?id=B5ojAwAAQBAJ&pg=PA0 as translated by Gillian Clark (2000), 1, 47, 3 
Quoted by Porphyry