I think it is interesting how varied the definitions are. The reference to trying the same thing over and over and expecting a different result is a smart quote, but it sure is not a very fundamental definition of sanity, or its inverse, IMHO.

For example, it is just as insane to obsessively alter a workable course of action, and expect the same outcome as if one had applied the action correctly!

It is just as insane to take NO action and expect a positive outcome, and, likewise, to take no action but predict a catastrophic outcome.

So that particular dog doesn't hunt far enough, even if he is cute.

A