Opportunists, on the other hand, have no particular specialty. They depend instead on their skill to sniff out any kind of opportunity in the environment and seize upon it. They are in states of constant tension and require continual stimulation. We humans are the ultimate opportunists in the animal world, the least specialized of all living creatures. Our entire brain and nervous system is geared toward looking for any kind of opening.
This opportunistic bent of the human mind is the source and foundation of our creative powers, and it is in going with this bent of the brain that we maximize these powers.
Mastery by Robert Greene