The qoute is from David Heinemeier Hansson the creator of Ruby On Rails.
It's really hard sometime to evaluate what is "the best" idea. The brain comes in and syas "it´s much better that you do this first". Then you can use that money to develop what you really want.
But the stomach feeling says something entirely diffrent. After many choices and many failures I still come to the conclusion that the choice that give you the right "feeling" is the best. Even if it may fail in the end.