Am I "Only Interested" or "Fully Committed"

Ken Blanchard in his book "The Heart of a Leader" mentions-
I learned from author and consultant Art Turock that we need to make a distinction between being interested and being committed. When you are "interested" in doing something, you only do it when its convenient, but when you are "committed", you follow through no matter what, no excuse."

I think this is a very relevant observation. I think people who manage multiple passions are not only interested and deeply in love with their areas of interests but are also hugely committed towards the same. They operate in a mode as if it’s their responsibility to contribute towards their passion every day, every hour no matter what. Many people get inspired and interested in pursuing additional interests but fail to pursue it for a longer period of time because the convenience factor creeps in with the lack of commitment. If one is committed to the cause, it’s not impossible to cross any obstacle.
If you like to do something but haven’t been able to pursue, just ask- Do i really want it badly ? Am i really only interested or committed also ?
The sooner one sorts out the answers to these questions, it lends the desired clarity to live with one's passions.