My dear man, there is quite a difference between using your brain to survive and truly using your brain.
Imagination is a wonderful tool, it empowers each of us to create thousands of what-if scenarios and be able to change the world to match that scenario. It's like internal virtual evolution, but thousands of times faster than natural selection could ever achieve. It is the single greatest power known to humanity.
Once I realized the potential of the power I had, once I realized I could change my life and change the world, it was impossible not to. We have all this power, but we need to stand up and actually do something about it, as opposed to simply surviving in apathy.
Because really, if survival alone is your goal, you might as well be living in a coma.