Great read, indeed. But, if it's not enough for some people, then check this out: http://youtube.com/watch?v=D1R-jKKp3NA (it's just 14 min, totally worth it). Long story, short: You have only 1 live. Do as much as you can with it!
Five years ago I decided to leave my full time job, to start some personal projects. Some of them where a complete dissaster, but others are going very well. They make my living, and now (after lot a work and effort) I can say I'm a very happy person ;)