From the book 7 Keys to Success by Will Edwards …
” … we need to notice what is working and what is not; and be prepared to change our approach in order to get what we want – that is the essence of flexibility.
A wise person once said, “If you always do what you’ve always done, you’ll always get what you’ve always got”. That is a wonderfully true statement – in other words, if you continue doing exactly what you are now doing, then don’t be surprised when you don’t see any increase or change in your results.”
Life's Best Advice 
amen.
This quote is basically just restating the definition of insanity.
Insanity- doing the same exact thing over, and over, and still expecting a different result.