Full Idea
There are some pleasures which are not good, and some pains which are not evil.
Gist of Idea
Some pleasures are not good, and some pains are not evil
Source
Plato (Protagoras [c.391 BCE], 351d)
Book Reference
Plato: 'Protagoras and Meno', ed/tr. Guthrie,W K C [Penguin 1956], p.88
A Reaction
Sadism and child birth. Though Bentham (I think) says that there is nothing good about the pain, since the event would obviously be better without it.