Where there is anger there is an expectation.  Where there is an expectation, ego is
present.  Attachment to outcome is of the
ego, the human side of you, not the soul. 
The soul says, “And so it is.” 
The human says, “I must have it this way or that.”  What you can expect with such an attitude is
great joy or great frustration, but rarely peace. 

Most do not realize when attached to outcome that
you have a choice of eyes with which to see: 
those of the human or those of the soul. 
This is true in all cases, in every moment of your life.  The journey from ego to the soul is what
spiritual awakening is all about. 
Frustration and anger are signposts to let you know far you have come
and how far you yet have to travel.