Can you answer this?

Yesterday I was reading a book "The Monk Who Sold His Ferrari". Its really a nice book which makes you think. While going through it I found a really intriguing comment made by the author. It read,

"The Key to eternal happiness is Find out what you truly love to do and then devote all your energy towards it "

After reading this, I was forced to question myself, "Whats that one thing which I'll love to do?" Though there are many things I really love to do and can continue doing for hours at a stretch without even bothering for my meals (I mentioned that cauz meals are one of the most important events of my day ), but I cant really make a living out of that. Say for example, I love cooking, but that doesnt mean i quit my job and become a chef. I love travelling, photography, surfing the net, but these things cant earn me a living.

The job which I'm doing right now is more a thing by chance than by choice. Got selected through campus, got into a S/W company & the company decided that I have to work for a Bank. Is this what i really love to do? Certainly not. If that would have been the case, I wouldnt be feeling sleepy daily after lunch, I wouldnt be counting days left for the weekend, I wouldnt be frowning watching the calendar shwing yet another Monday. Then Whats that I really want?

Do you have an answer for this? Do you know something you love so much that you can devote all your time towards it? And most importantly, are you courageous enough to quit what you are doing right now and switch over to that thing? I get really confused when i ask these questions to myself. What about you?