Most success in life is a result of ignoring what current you feels like doing in favor of what future you will be glad you did.
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Another part of the reason is that it's hugely important to cultivate awareness of what you enjoy. When you constantly suppress it, it's really damaging, IMO. (My personal experience, other people's mileage may vary!)
I forgot a third one, sign of my puritan inclinations. It's good to enjoy yourself 
(Thanks to anyone reading this long list of replies. This has all been very much on my mind.)
