bendover:
Sort of like the definition of insanity. "Doing the same thing over and over again and getting the same results."
The quote is "doing the same thing over and over again and expecting different results". Lots of people are mad. For example, you can drive out on to a little-used road without looking and without any problem hundreds of times, yet some insane people persist in believing one day you might cause a crash.
Doing the same thing over and over again and getting the same results is how most people live. Walking, for example.