When one door of happiness closes, another opens

"When one door of happiness closes, another opens; but often we look so long at the closed door that we do not see the one which has been opened for us." Helen Keller

I found this quote in the book "Option B" by Sheryl Sandberg, former COO of Facebook, which is a an incredible book for anyone who is dealing with loss or having difficulty coping with disappointment with something in their lives.