Paul Graham - «Fashionable Problems»: some citations

Even though lots of people have worked hard in the field, only a small fraction of the space of possibilities has been explored, because they've all worked on similar things.

If you can find a new approach into a big but apparently played out field, the value of whatever you discover will be multiplied by its enormous surface area.

The best protection against getting drawn into working on the same things as everyone else may be to genuinely love what you're doing.