One Strong Belief

Well this is a hard one.  One belief?  I would have to say that I believe that one should not mess with mother nature.  In that if I were to have a heart attack, I do not want to have extraordinary measures taken to save my life.  When it is over, its over.  Same goes for cancer, etc..  Let it run its course, keep me comfortable while it is happening, and be done with it.
What inspires this belief?  Well, it is my opinion that the human race is getting weaker as a whole because we keep people alive whom nature has marked for natural elimination.  Harsh? yes.  Same goes for animals.
How do I actively live it?  I try my best to keep my self healthy and relatively fit.

It is easy in the world to live after the world’s opinion; it is easy in solitude to live after our own; but the great man is he who in the midst of the crowd keeps with perfect sweetness the independence of solitude. - Ralph Waldo Emerson, Self-Reliance
The world is powered by passionate people, powerful ideas, and fearless action. What’s one strong belief you possess that isn’t shared by your closest friends or family? What inspires this belief, and what have you done to actively live it?