A friend and I are trying to trace the source of a quote. Unfortunately we only barely remember how it goes. Consider this as a rough bit of paraphrasing:
Any person who wants to govern should be disqualified from doing so.
We've both tried Google and philosophy.stackexchange, but haven't turned up what we are looking for.
To the best of our memories, the context went something like this: People only seek power for their own motives. A ruler ought not to decide based on their own benefit, but society's. So a person who wants to rule should be disqualified for doing so.
We have settled on two possible leads (both of which may be wrong): it may come from Plato's Republic, or possibly one of Bentham's works.