" We worry so much about negative peer pressure- whether from the toxic coworkers who infect us with their pessimism, the classmates constantly getting our kids into trouble, or the wealthy friends who pressure us into taking vacations we can't afford- that we often forget all about the power of positive peer pressure.
Just as being around negative, unmotivated people drains our energy and potential, surrounding ourselves with positive, engaged, motivated, and creative people causes our positivity, engagement, motivation and creativity to multiply. In my work with companies, I created a formula to highlight the basic principle at the heart of this strategy: Big Potential = individual attributes X (positive influences - negative influences) "

― Shawn Achor , Big Potential: How Transforming the Pursuit of Success Raises Our Achievement, Happiness, and Well-Being