Why quitting your job makes you more honest

So, I'm quitting my job, it's been a great almost six years and I've learned a lot.  It's been the most challenging and most rewarding job I've ever had.  With that said I've been ready for a change for sometime, and finally the perfect opportunity has presented itself.  Having given my notice I've found a sense of clarity that allows me to better speak my mind.

In other words I've been a lot less P.C. about my comments, without being unprofessional and flippant of course.  But the honesty has been refreshing, in the past few days I've accomplished more and been more productive socially than ever at work.  It's so much easier to build and maintain relationships when you're honest with yourself and others.

Here's the thing, (yes, there's always a thing), why can't we always have this level of honesty? Why does it take such a dramatic change such as quitting your job allow you to ditch your inhibitions?  If we were all a little more honest all the time, not so much that you become hateful and brutal, but enough that you are comfortable with your decisions, I think the world might be a better place for you (and me).