“If a system is going to change, someone has to begin behaving differently.”

Edwin Friedman, Rabbi, Family System Therapist, author of Generation to Generation & Failure of Nerve

I also heard him say something to the effect of "when a system is stuck, you can't think your way out of stickiness."

However, be forewarned. When you start behaving differently, you'll wake up feeling great one morning. Watch out. Most of us know this from a little life experience.