Master of Fate?

"I am the master of my fate; I am the captain of my soul." William Ernest Henley

Is it true that we are masters of our fate?  Only to a certain extent, it seems to me.  Viktor Frankl found in a concentration camp that the only thing over which we have control ultimately is our attitude, and I think that is true.  We have the choice of how we do the job of caregiving, but many of us did not choose to become caregivers -- it was more that we rose to the occasion.