In 'Hide and Q', Q gives Riker the power of the Q. I always found myself agreeing with Picard that he shouldnt use his power to change the lives of others or affect the natural course of humanity. However, I always found myself thinking that if I was Riker I would just head out to the stars, live forever, see amazing things etc, and be pretty happy with my new power. I suppose you could argue that you might eventually grow used to that power, and seeing humanity in some terrible scenario renege on your good intentions and speed to the rescue.
What would you do?
What would you do?