Full Idea
I am fairly certain that no wise man believes anyone sins willingly or willingly perpetrates any evil or base act.
Gist of Idea
No one willingly commits an evil or base act
Source
Socrates (reports of career [c.420 BCE]), quoted by Plato - Protagoras 345e
Book Reference
Plato: 'Protagoras and Meno', ed/tr. Guthrie,W K C [Penguin 1956], p.80