Insanity: doing the same thing over and over again and expecting different results.

Doing the same thing over and over again and expecting different results when, in fact, the results never change, is one definition of insanity. That goes for economics, too.

I am told that the clinical definition of insanity is the tendency to do the same thing over and over again and expect different results.

The definition of insanity is doing the same thing over and over and expecting different results.

Any actor wants to do interesting roles, different roles. It's not all that much fun to do the same thing over and over again.

It gets so boring you know just to do the same thing over and over again.