The article I referenced above includes this quote from the book "The Meaning of Life" by Viktor Frankl.
"Everything can be taken from a man but one thing,the last of the human freedoms -- to choose one's attitude in any given set of circumstances, to choose one's own way."
Frankl found meaning in his importance in the lives of his family members. His wife and children looked to him for strength and for an example of how to survive the horrors they witnessed daily. This gave his life purpose. There are countless people who "hold it together" when they feel like falling apart because there are people in their life that count on them. For creative people, continuing with their creations gives them purpose and provides them strength when life seems to fall apart. It often is something outside of ourselves that gives us purpose and meaning.
Here is my favorite quote from the article.
"But happiness cannot be pursued; it must ensue".