Gravity, for example.
I can't do a thing about gravity. Even if I wanted to move to Jupiter or the moon for a change in gravity, it's inconceivable that I could.
On the other hand, there are lots of things I can do to control my reaction to gravity. I can take Alexander classes or get in better shape. I can avoid situations where gravity makes me uncomfortable (the trapeze, for example). I can choose to not whine about gravity and its effects.
There are countless forces in our lives that are out of our control. That doesn't mean we can't do anything about how they influence our work and our life…