Well that's his point I think. The same exact job can be fulfilling and meaningful one day and annoying drudgery the next.

You have a good day at a gaming company and you feel like "I did something very fun today and at the same time made the lives of a bunch of people more fun. This is great."

You have a bad day and you feel like "Stupid games. Stupid gamers. I'm wasting my life."

Both feelings are legitimate interpertations of the exact same work situation. What he's trying to teach us is how he attempts to turn one of those into the other.

I, for one, have the same issue all the time and I really liked his advice on how to deal with it.