The science about how commuting long distances makes us unhappy and less healthy made me change my beliefs and also take action. I used to downplay the amount of suffering and health issues that accompany regular commuting, plus the risks of e.g. driving a car on a daily basis, especially very early when I was still incompletely awaken.
Reading about this and all the invaluable articles by lukeprog on lesswrong ("How to be happy" and others) made me form a more accurate belief of what really brings about happiness and satisfaction to our lives.
I looked for the flat I currently live in a walkable distance (c. 15 minutes) from my office, and my life has been vastly improved: better sleep, more exercise, more free time, and a better mood overall.