What’s the best way to come up with your startup idea?

Paul Graham (Co-Founder & Partner at Y Combinator)
How to Be an Expert in a Changing World

Good new ideas come from earnest, energetic, independent-minded people. [A] trick I’ve found… is to focus initially on people rather than ideas. Though the nature of future discoveries is hard to predict, I’ve found I can predict quite well what sort of people will make them.