Derek Sivers had a related comment I always think of. Very roughly, the idea is: instead of trying to love what makes you money (or make money from what you love), pick a tolerable career that makes you decent money, and then don't force your passion to be profitable.
Of course, it's hard to get excited about that when you throw 40 of your most energised hours of the week at a grind.
Of course, it's hard to get excited about that when you throw 40 of your most energised hours of the week at a grind.