I was just reading that article on resilience posted on this site. One of the items mentioned was Viktor Frankl, who wrote about the importance of a sense of purpose in ‘Man’s Search For Meaning’.
I recommend this book to anyone who's depressed. Frankl was a concentration camp survivor who was separated from his wife, yet even in that situation he found hope and a sense of purpose. It's not a sappy, bunnies and rainbows book, but intelligent and inspiring.
It's also short and an easy read, which is an advantage for those of us who don't feel like reading even one sentence!
Here's to all of us who struggle with finding a purpose in life. May we live long and prosper! (-;